If a cop tells you "i've been working for X years and haven't pulled my gun once" he's either full of it or not a very good cop and just plain lucky stuff hasn't gone down while his gun sat in the holster.
It would also depend a lot on where he practices his trade. I can show you dozens of cops that have never had to pull their weapon.
Cops in Warren MI may pull theirs every night. Cops in Bosque County, TX may not ever.
As far as training...each person must decide how he will train...and for what type of threat he will train for.
Those that have hung around here long enough know I firmly beleive in picking a platform and sticking with it. I don't care if you own 200 Sigs if Sigs are your platform of choice, but I don't think you should switch around between 1911's or other guns for defense.
I think that applies to training to a degree. If you jump around between trainers it can mess you up more than it helps.
I'll give you an example:
School A teaches reloads where you drop your spent/partial mag on the deck and insert a new one. You never retain the mag.
School B teaches you to retain your mags.
So now you have two conflicting methods. If you spent 6 months practicing what you learned at school A, you know have to undo all the work if you adopt B's methods. At the least you have to spend a lot of time evaluating both methods to find which you can adopt to fit your skills.
I went to several different schools (one of which I had never heard of...) and settled on one that offered what I beleive is the better system. And it covers all the different weapon systems; empty hand, impact weapons, edged weapons, hand guns and long guns.
Should the day come that I have learned everything they have to offer (not likely) then I can look to other schools that and try to work what I can into the methods I have adopted.
Pick a platform and stick with it, pick a trainer and stick with him, until you are his better.
Smoke