In fact, I've had a lot of players become less problematic once using 3d terrain. And it Quickstrike, the full time DMM removes a lot of the problems of pople plotting out every possible move location--they just move their mech within the radius their mech can move, plop it down, and are happy.
Sure, here are some players out there who seem to demand a lot of review of LOs markins, but those are the type that generally make play in general always a slow mess by arguing rules, demanding to look up every reference question, wanting to recount an opponents movement every time.
Once you get a group thats had enough experience and learned to trust one another, terrain play moves just as quick or quicker for movement and LOS purposes, especially compared to complex paper maps with lots of terrain features and elevation changes.
I run QS with and without hexes. One advantage of mapsheets is that its easier to reintroduce artillery, but I'm comfortable using my homebrew coordinate system for artillery resolution for full terrain games even with full total Warfare rules. But freedom from hex facings, just turning and moving as you wish is a joy.