Grease injection is a major timesaver, plus avoids the risk of mis-adjustments on bearing setup.
I never disassemble pedals anymore for cleaning. Fussy setup and a million little ball bearings. If they are set up reasonably, I just blast new grease in from the outside of the pedal (usually a hole in the dustcap). The old stuff gets pushed out towards the inside for cleanup.
If the pedals do not have an injection port, then I remove the dustcap and drill one.