It's hard to say if there really was anything actually *comforting* in that life, but... there's two things that qualify, at least to me.
One is my wings - flying was the only time I felt any iota of freedom. Even tho they tracked my every move, tracked my location... it was freeing to do a little flip. Or a barrel roll. Just, little tricks in the air. The sensation of wind rushing past me is a comfort, then and now.
The other is the cold - I guess that comes with having been frozen until I was needed again. It just felt like an involuntary deep sleep. It was the only time where I could rest, and even in this life, I prefer the cold. Not that I can stand it for anywhere near as long as I could then.
I wouldn't be surprised if others who dealt with it hated it. It feels very much like the kind of thing where you either hated it or liked it.
- Project M6, Codename: INFINITY
(Noncanon Hydra Asset, MCU)