Actually, what features do I use?
Exposure modes - I use the usual SPAM ones, mostly aperture priority.
I change the drive and autofocus modes from time to time for action shooting.
I sometimes switch metering pattern from evaluative to spot.
I use exposure compensation and exposure lock.
I change focus point sometimes - normally I just use the centre one when using AF.
Sometimes I change the WB; normally, though, I leave it on auto.
I sometimes use the B&W modes so that I can check the result on the screen.
I use the custom functions for mirror lock-up and second curtain flash synch - oh, and the one that tells the camera I'm using a different screen.
Flash exposure lock sometimes gets used.
I really don't shoot JPEGs, unless I'm using a shot for work.
Beyond that, it's shutter speed and/or aperture, ISO, shutter release, depth of field preview and use of the review screen. In many ways, it's very little different to me from my film days