I find myself using Quen almost exclusively. Aard only for doors, axii only for alghouls on DM.
Everyone loves Igni, and yes it looks cool, I just forget to use it lol.
For my first playthrough I used Ursine armor so I only ever had stamina for Quen, so not really any other signs being used.
Now that I play on DM, I use a few more: axii for alghouls, Yrden for wraiths if there are a lot of them (I find these REALLY hard on DM, don't know why, I just suck lol).
Crossbow only for underwater, occasionally for flying monsters, especially sirens and harpies (damn I hate those).
Counterattack I use occasionally with humans.
I NEVER DODGE. I just roll. Don't ask why. I guess the space bar is just more easily accessed and feels more natural. I only EVER dogde in fist fights, and I only completed them to get the Steam achievments on my first playthrough.
On all other playthroughs I didn't fist fight because I actually just don't like it, I don't find it fun, just frustrating.
Other than that, no dodging.
Never used decoctions - then I started playing on DM! Yup, I need them now haha. Doing an alchemy build and they are extremely powerfull, it's a lot of fun playing with decoctions actually. I'm glad I tried it out, after not using a single one during first playthrough.
Oils I use religiously. It's just a cool feature and free damage.