4x12s can be 'beamy', which is why a full stack gives you much more projection. It also greatly improves the dynamics of your rig. Even though the potential to move a lot more air is there, it's not necessarily over the top compared to a half stack.
All decent 4x12s are very heavy, however.
Though I own multiple 4x12 cabinets, for most gigs, I use a single 4x12. However, that's due to limitations on my listening space, not necessarily on venue size.