WRNV967

Actually I have CTCSS and DCS on receive disabled for repeater channels and only use tones on transmit. That way I can tell if somebody is running simplex on a repeater channel, if I have two repeaters on the same frequency, find new repeaters, etc. I've got a decent antenna and radio (KG1000+ feeding a Comet GP-6 GMRS) and don't really get much if any interference from out of band to really need tone on receive.  I also keep the repeater input channels in my repeater scan group as well to see I can can receive the input and how strong it is (make a simplex buddy!) or if there is somebody talking simplex on them causing interference to the input of a repeater. This actually happens a lot, we have a shipping port near two of our repeaters and some foreign ships use 467.5500 and 467.7000 simplex causing havoc on the repeater inputs for a day or so until they depart the port.

The most popular Ham 2M repeater in my area (Utah County 146.76) has almost no tail to where slower radios like Baufeng UV5R may no indication or tail which seems to actually encourage "Kerchunking" since people do not know whether they have hit the machine or not. 

The family repeater I put together had a decent squelch tail but I know what you mean about not being able to tell when you have keyed it up.  I was not sure what kind of tail if any I would get from my RICK style repeater but it surprisingly has a decent tail on it.  If not that would have been one of my first priorities. 
My thought is you may see some hams that look down on courtesy tones since the it feels too CBish, yet in my mind they do serve a purpose beyond cycling the transmitter relays.  Without even thinking about it, it lets me know if the other operator unkeyed or otherwise dropped out of the machine versus the possibility that it is my receive that has changed, especially when mobile.  Certainly there are plenty of ham repeaters out there with courtesy tones and not once have I ever thought to myself, "oh this tone is so annoying".  I really have come to the conclusion that there are many people that just want to bellyache and complain.  While, I would not add some CB 5-tone "roger beep" I think a modest courtesy tone is a great addition.  Even NASA uses tones for the astronauts.  ?

I like courtesy tones for digital radio, where there is no obvious break, but not for analog. I prefer a slightly extended squelch tail on analog. 
Dealers choice, as the say.

The only repeater I have with one is the linked repeater.  And it's a three tone setup.  One tone is for Linked RX, second is for local receiver RX and the third tone is only heard when the repeater is NOT linked to another node or hub.  I do this to inform users that they are both local if that's the case so they can switch to the local repeater and not tie up the system.  The third tone I use to verify the system is linked up.  I can key and ID and know if things are working right or not. 
 

I like it for that same reason.

RFI better know as Radio Frequency Interference can do weird and funny things to near by equipment. It overloads the equipment's  frontend and electronics and causes all kinds of fun things.. Just like you experienced with the alarms that was on the tractor around the construction site. I bet if you move further away than 20 feet from it it might not have happened. I have been behind many of my buddies knowing they are speeding and have set off there radar detectors with my gmrs radio and other radios because i was close to them and overloaded the frontend of the radar detector. Funny as crap to watch them hit the brakes cause they thought a cop was around radaring.. RF can and will do very weird things.. That's why the FCC has RF Exposure limits on certain frequencies. 
 
https://www.fcc.gov/general/radio-frequency-safety-0#:~:text=The SAR is a value,(1.6 W%2Fkg).

Can't run 141.3 tone would love too but might interfere with the 462.575 Cades Cove repeater with 141.3 hz  travel tone. So i just did a multi tone repeater access tone today. Still got the split tone but added 203.5 hz on input tone and output tone for access for gmrs people that there equipment doesn't do split can have access . The only reason i did that so people that done had the repeater programmed wouldn't have to reprogram their radios and still have access and be able to talk to the other. Don't know if anybody has ever ran multi pl / dcs tones on a gmrs repeater before?