Most of my brewing & serving stuff has gone unused for a couple of years or more, as I've moved house a couple of times and it's taken a long time to get my new place fixed up to a point where I can start getting back into it.
I have several CP taps, all good quality Andale EK type. 2 of them I bought new (although not at the same time) then I found 8 old pub ones at my local scrap metal yard. They've all been used in various fixed and mobile setups over the last 10-15 years and occasionally left a bit too long without cleaning.
Time and neglect has not been kind to them. One of the 'new' ones that was left on a serving fridge under the verandah now looks the same as the really old ones. The CP hasn't flaked, it's just disappeared in places. It has been out of the rain, in a dry climate, so it appears that dust and general grime are the culprits. It's buddy was stored clean in a plastic tub and is pretty good, but I was expecting it to look new (it never really got used) and it doesn't. Again the CP has simply faded in some places and pitted in others. I haven't dared open them up yet but I know they will all be pretty nasty inside and I'll be very surprised if there's any CP left there at all.
I guess what I'm trying to say is that in comparison, SS taps are indestructible. You have them for life, regardless of what life throws at you. You can forget to clean them or leave them on your portable rig all winter. You can also use them for more acidic things like cider. Take a break from brewing, or lend them to a mate while you are O/S, doesn't matter.
I've never had flow-control taps, but I've never felt like I'm missing anything. I certainly wouldn't pick FC over stainless if I had to make the choice. Good stainless taps will last forever, they'll take plenty of abuse, and they'll always come up like new after a clean.