My experience with LabVIEW, for the brief amount of time I worked with it for our high school robotics team, was slightly frustrating. I liked the dataflow paradigm, and to some degree the dashboard system, but connecting and managing the "wires" was a pain. Especially since I'm more comfortable/faster with a keyboard than I am with a mouse.

It also seemed to be harder to read and understand the flow of the code, which made debugging a pain sometimes. I remember struggling to figure out why my code wasn't working, only to find out I had used 1 instead 1.0 as a constant. The only indicator of the data type was a thin colored border around the box.

LabVIEW seems to do a great job as a kind of Visual Basic for scientists and engineers, but I'd probably find it frustrating to spend any substantial amount of time programming with it.