When fishing the trout parks or rivers like the Current and Meramec, it is rare that I have a fish "on the reel". The excess line usually lies loose in the water as I play the fish and strip the line in with my left hand.
Taneycomo is a little different, with its possibility of hooking large trout. When I have a large one on, I let it run until all the slack is gone and I play it on the reel. But even then, the drag is set very light and I "palm" the spool to control the tension. I still don't wind the line in, I like to strip it in and let the excess lie at my feet.
So, in short, for me the drag does very little, so I don't invest in reels that have the better drag systems.
To each his own, decide for yourself if a drag is important for your style of fishing.