The only reason I don't use tmux is because of how annoying it is to look at scrollback. Am I using it wrong?

I would "just" do C-B PgUp and then use vi-like movement keys like hj, gg/G etc., and q to escape the pager, but I realize now that I say it that it doesn't sound very convenient or discoverable.

C-b [ allows you to scroll up/down