Yeah plastigauge is not a plastic gauge, it's like clay that smooshes out, I'm sure there youtubes on it. Fancy pants pro race engine guys I've talked to like it because it takes everything into account and gives you the real clearance the bearing is seeing.
The nice thing about it is that you put everything together and torque it all down so you are taking into account all the gasket compression and everything. Just torquing the screws can be .005 of change. You gotta do a little math but it's pretty easy.
The way I do it, I dunno how it's not accurate, I put 2 little pieces on the shims across from each other on both bearing shafts, the only time it's annoying is if I'm already too tight, in which case you gotta repeat it a couple times. I do the crank end float with a depth gauge and only have had to pull a bearing off once.