I seem to be in the minority here. I have custom earplugs (non-monitor type) with inserts that reduce decibels by some amount, I can't remember exactly how much, but it's the smallest amount you can get (at least when I bought these).
What I've found out is that I like them if I'm practicing at home alone. If, however, I remove them for whatever reason and continue to play, everything then sound horrible. All I seem to hear is the 'highs' that were blocked before.
In a concert or rehearsal situation, I get frustrated that I can't hear the other players as well as I want and I usually end up taking them out.
I am lucky though as I'm in my fifties and have been playing the drums for forty years and my hearing is still pretty much perfect. Much better than some of my 20-something musician friends. Knock on wood, I guess!