I hate them. If I pull the trigger, I expect the hammer to drop (or striker, or whatever). The Ruger 22's (MKIII, 22/45) mostly come with them, and I've removed it in both of them (Volquartsen bushing). To take these Rugers apart, you need to drop the hammer at one point, so it ends up being a dance of remove the mag, do some stuff, put the mag back in so you can pull the trigger, then remove again, etc. They are already difficult as it is to take apart. Thankfully, Glocks don't have them; you need to pull the trigger to disassemble those as well.
And I agree never to get used to them; it's unsafe, and sets bad habits. Better to not have them in the first place.