You can get Floyd bridges that don't require snipping, but in any event, let's just assume that snipping is the norm and agree that Floyds CAN be a pain. Like I said, that doesn't address any of the benefits, which are listed fairly well here by redwhiteandthemaple.
With regards to locking tuners vs. nut, most if it comes down to what redwhite mentioned, PLUS the fact that there's no such thing as a perfectly friction-free nut. That being the case, after a serious divebomb, the strings won't be in tune with relation to each other anymore. You might get close, but that's about it.
With a locking system, the nut is taken out of the equation, and the slack after bridge is taken out of the equation. Literally, all that is left is the length of string between the nut (not beyond!) and the saddles (not the string length between the true 'bridge' and where the ball end is anchored. That doesn't mean that locking systems are always perfect. For example, locking trems that have poor engineering or manufacturing at OTHER points of serious friction in the mechanism (ie. the pivot posts), crap springs (laugh, laugh like you will, but it matters!), or even just a poor setup job, will still fail. But with a proper Floyd, manufactured by someone with proper care and Quality Control, will always hold up to "whammy tricks" more effectively than a vintage-type trem.
In any event, I don't trust what my friends say about such things, and I don't even trust most guitar store employees about such things. Too many times I've encountered salespeople who really don't know jack, and these are the supposed experts. So no matter what your friends or the PRS peeps say, take it all with a grain of salt and make your own evaluations, after doing as much objective research and critical thinking as you can stand.
Greg