It's a long conversation and hard to have here/in-comments, but I'd encourage you to look into it again, for several reasons. I get the focus/creativity aspect for sure!
1. Medications have come a long way, and there's more than just Ritalin (or Adderall) as options. I get the grey scale concept, but I don't think it has to be that way. There are varying doses and varying medications, and you might find something that is almost all upside with (possibly) no downside.
2. You might perceive yourself to be managing / coping fine (and you might be, I don't mean that in any disrespectful way!) but there could be vast undiscovered focus abilities you could access. For me personally, the difference on and off medication is VAST.
3. You might not always have that manager/environment. Or (what happened for me) someday you might (already) have a family, and fewer options for those bursts of focus. I used to work until 3am when I was on a roll, but now I can't.
4. The distraction / multiple threads stuff can have other impacts on your own self-image. Depends on how well it's managed I guess, in the world and inside your head.
Good luck! :)