Ever hear the expression, "playing 'golf swing' instead of golf"? IMO, high handicappers really have no choice but to play 'golf swing' instead of golf. I mean, right? What's the point of visualizing your tee shot with a gentle draw down the left side when you're actually going to hit a hard slice into the bushes? Should I take on those bunkers at 250? . .well, I'll have to clear the ladies tee first, lol.
It's not just high handicappers. As a mid capper I feel pretty much this same way. If I just go out and swing smooth and natural and visualize the results I want, I'll play 10-20 strokes over my handicap. No kidding. My solution is to think about mechanics and what I'm working on and whatnot during my pre-shot routine and practice swings, then try to minimize my thoughts during the swing itself to just one general thought about the thing I most need to emphasize at that moment.
Not that I necessarily recommend this method, it's just what I do. And this is the major reason why my pre-shot can get overly long, especially when the course is playing at a quick pace. For this reason I also tend to play worse when I have to speed up my pre-shot to keep pace (which I do, I just tend to play worse). Finally embarking on the first major swing overhaul in a while, so hopefully I can ingrain some better habits to the point where the natural, fewer thoughts and less mechanics-focused pre-shot routine will lead to better outcomes, not worse.