I'm a nerd. My cameras are perpetually in:
M mode
Manual white balance (K mode)
ETTL off, setting flash power in manual
and honestly, I manual focus a lot, which is why I love Live view
Do it for a while, and you just get used to it. It might slow you down at first, but then you'll soon be just as fast or faster than auto.
It's gotten to the point where I sometimes don't even bother to look at the meter anymore. Practice a LOT and you'll be able to walk into a room and "see" ISO200 F/1.4 1/100, 4500K M2. You can be dialing in the settings before most could even put the camera up to their faces to look at the meter. (It's taken about 20 years of practice)
Whatever mode you decide to use, if you use it a lot you'll become efficient at it and your technical shooting style will be molded around it. And of course, you can become very good at it too. So it really doesn't matter what mode you use. P or M, and anything in between.

