The feature I'm imagining will only snap to a possible position when it is within a couple of pixels. This should be small enough that is will act to help the programmer align things exactly as he/she wants. So, if you want the tops of subVIs to line up instead of straight wires then no problem. Want bend the wires in a readable way, no problem. Basically, you place the item where you want and the program helps with the micro-positioning.
You would have to place the terminal within two pixels of aligned to trigger the snap-to; nothing is forced on the programmer. Now, if you actually wanted the terminal one or two pixels off alignment with another, you would need to hit the arrow key once or twice. Hopefully, such situations will be rare. If not, there would be the ability (including a hot key) to turn the feature on/off.
Unfortunately, it's hard to verbally communicate the advantages of CAD-like guides.
-- James