This Quick Drop plugin - created by NI community member RoboticsME - does exactly what its name suggests: It aligns all controls and indicators based on the default grid size (12 pixels), also resizes the windows to fit, and even turns off increment/decrement visibility on numerics. And all that magic by invoking the default shorcut ctrl-A!
Find the download - and a very interesting discussion in the comments - on NI's LabVIEW APIs Community page.