National Instruments' LabVIEW is a really good graphical representation of code. However, my experience was that it got frustrating after the program got large

National Instruments' LabVIEW is a really good graphical representation of code. However, my experience was that it got frustrating after the program got larger than about 40 subroutines because each subroutine gets its own graphical window (two, actually: one for the UI and one for the code). This leads to a lot of clutter and it gets hard to debug. That and debugging loops or errors in a complex algorithm in a graphical setting is not fun. Text based is a lot more efficient.