Funny, I never had a problem with the recoil of the 8mm M48. I fired 40 rounds of 196gr S&B and close to 100 rounds of FN WWII surplus a few weeks ago and never encounted any "pain" during the session. However, I also have a strangely high pain threshold.
My Enfield is also a downright pleasant shooter, though the water-damaged stock was replaced with a monte carlo sporter, so that may have affected the perceived recoil.
I can determine the severity of recoil, and I find the M44 with Wolf 200gr SP ammuntion packs a nasty thump. I think I'd develop an uncomfortably sore shoulder after a couple boxes of that.
The award to the most pleasant shooting WWI / WWII rifle (besides the M1 cabine) would be the M96 Swedish Mauser, IMO. That 6.5x55 is a close to a magic bullet as you can get.
Jedi, after a session with my M44, I noticed the 200gr(SP) kicked considerably more than the lighter fodder, including Czech silver tipped ammunition.
However, recoil perception is subjective, so a general consensus may never develop.