Kick, snare top, snare bottom (sometimes), Hats (sometimes), tom1, tom2, tom3, tom4, Overhead1, Overhead2, Room mic, Kick Trigger, Snare trigger, tom trigger1, tom trigger 2, scratch guitar.
I often use 16 mic preamps to track drums. I often don't use some of them after they're recorded, but I have them just in case.
I only have 7 channels of good preamps at the moment, so depending on the style of music I might use..
Focusrite ISA One: Kick
Focusrite ISA 428 1: snare
Focusrite ISA 428 2: tom1
Focusrite ISA 428 3: tom2
Focusrite ISA 428 4: tom3
Great River MP-2NV 1: Overhead 1
Great River MP-2NV 2: Overhead 2
Everything else goes through the preamps built in to my interface.
For a more classic rock or bluesy band, I often use the Great River on kick and snare and the ISA 428 on overheads.
Also, I regularly use 2 mics on an acoustic guitar, 2 on an open back guitar cab, 2 on stereo keyboards, often 2 a 4x12 cab...
Sometimes I record more free-form music with everyone playing at once. At those times, you will wish you had more great preamp channels and more great mics. There never seem to be enough.