At Bay Star we run BLS trucks and the paramedic responds on a squad for transfers and 911 calls. Now our day crew paramedics work on a truck with either an EMT-B or an EMT-I. One of my 24 crews (they don't rotate, but we as paramedics do) has two paramedic students who are just waiting to test, and one of them is an EMT-I; so it is nice to have the extra set of hands on that crew. (They are all awesome crews though, just nice to have an EMT-I so he can grab the line while I get the tube.)
At the City of South Houston (SoHo), we are down to three paramedics, and soon will only have two because one of them is having a child. So it is rare that we even get to work with another paramedic (although I'll be one for a few hours tomorrow). Quality paramedics are hard to come by in the Houston area. Most that are decent don't find themselves with out a job that often, and those that are usually not employeed are that way for a reason.
I think that soon we will see more services start to go towards dual paramedic trucks as the pay increases. A few of the cities around here run dual paramedic trucks.