I'm still a sucker for bringing minnows. Very often let 90% go after the day is over. But definitely days that they are the only thing producing for me.
As for my favorites - I am a fan of the Gulp minnows, both 1" and 2.5". Also like to make my own jigs, either with the 1/32-1/8 jig heads or a hook with glass bead head. Either plain if willing or tipped. Little pieces of the bright colored trout worms work well for tipping, but Gulp seems to have them hold on. Definitely days that they will take a certain color tube over anything else.
I do find a boat to help a ton with crappie, and most fish for that matter. You can hit many more brush piles and easier access to most submerged structure, as well as ease of moving from spot to spot. Knowing the lake and seasonal movement is more important though. There are guys that don't need a boat, fill up a cooler to the top, while I'm casting away my tackle box into 10 unproductive brush piles...