"Common" is a tough term to define.
Insulin pumps are used by a significant, but minority proportion of diabetics. The majority of pumpers are type I; a rather small proportion of Type II diabetics use pumps.
If you are not on a basal/bolus regimen for treating your diabetes, you will with almost 100% certainty not be eligible for insurance coverage for a pump. Pumps deliver ALL insulin your body needs, not just supplementation.
Basically, once you're in the position of having to essentially fully replace the functioning of your pancreas with externally administered insulin and your brain, a pump can be an incredible alternative to many shots throughout the day. Because of the prodecural convenience (push a few buttons on a device vs. all that's involved with an injection), and technology that helps manage and track insulin.
If you're achieving good control with Lantus and Victoza, and are not suffering any serious side-effects, you're probably better sticking with that treatment regimen.
However, if you are not achieving good control (a1c >=7%), or want to commit to tight control (a1c <=6%, minimize BG excursions post-meal, get as close as possible to a non-diabetic BG profile, etc.) then a pump is, in my experience and opinion, a necessary tool.