If it's loud and it needs to be loud, I'd rather use headphones. Occasional brief blast
with the cans off to check I'm still calibrated right, but otherwise I'll keep them on. I
can hear details better at lower levels, and I'm not beholden to the vagaries of earplug
frequency responses.
Loud in this context doesn't necessarily mean loud for
the punters. A mix position a few feet directly in front of a speaker in a small venue is
not necessarily the best place to mix from!