I regularly have days where I think "did I take my drugs?" I can often tell by looking back at my day, and realising how much I got done, without running out of mental energy. My partner can also tell quite reliably if I've forgotten.

I'm still me, just a bit less scatter brained, a bit more productive, and better able to focus. I lose some creativity, but that's a fair trade for actually being able to apply my creativity.