I use quick controls a lot, Mainly they are assigned to some Control Room functions such as dim, reference level, talkback. but I often find I reassign them temporarily depending on a specific task, for instance during mixing sessions I use them to switch between different sets of monitors.
Sends - sometimes, for instance if adding delay spins etc. I use them then fine tune with automation.
Just for routine setting send levels, not so much. I tried for a while but it didn’t stick in my workflow somehow.