That's right, I find myself using more and more one shot samples just to get more punch out of real drums but I also I find many uses for large multi velocity samples such as ghost notes replacing/reinforcing, replacing sounds from MIDI parts as you said or simply having a wide choice of velocities to reinforce a real snare, tom, etc. in every situations. I program quite often drum parts these days using EZ drummer and (I may get insulted for that ahah!) I don't like Metal Machine, Made Of Metal (I like it more tho) enough to keep these samples on the final product. I always end by replacing with more natural sounding samples.