I ride decent pedals and feel it's worth keeping the spindle bearings properly greased. Taking them apart is a pain, so I've hiton an easy solution taking advantage or the fact that on pedals only one side is open and exposed to dirt and water.

My pedals all have thread dust covers, and I bought or scavenged an extra cover for the two brands I ride. I fitted a Zerk grease fitting to the dust cap, and whenever I want to lube, I switch caps, and pump grease through, until it comes out clean at the spindle. The only drawback is that grease will continue to weep from the pedal for a while, so I need to do a bit of cleanup now and then.

My old Frejus's original pedals now have over 50k mikes on them, and still are good as new (at least as far as the bearings are concerned)