I've said it before and I'll say it again. Speed of laying down primitives/controls is a non sequitur. It even pales in comparison to the time spent making sure wires were straight and non-overlapping (which I find oddly relaxing). I estimate that as little as 10% of my programming time is actually placing VIs, controls, primitives et. al. Another 10% aligning controls and wires and the other 80% is iterating, refining, debugging and documenting.
Making a whole new ide because it is "more efficient" is an excuse you use to management and sales to fund your project when you have no concrete arguments. The real reason, IMO is more to do with that people are so afraid of touching the existing LabVIEW code and they have a glut of .NET coders who suffer from "not invented here" syndrome.
I'm banking on that by the time they get anywhere near parity with the proper LabVIEW, I will have retired and won't have to use it.