Personally, I think frequency splitting may be quite a help when it comes to processing the final sound, but I get all the movement of the bass down from the off without any processing whatsoever. I also try to stay away from saws and squares and triangles- I find it hard to get unique sounds using the basic waveshapes, I want my waveshapes to sound different and dirtier.
For the movement there are lots of things you can do but remember it's not always about filtering and using lfos- anything you can potentially move to change a sound when you're creating it could be what makes the sound sick. It's all about getting really into whatever synth you're using and getting crazy experimental with it.