Pro tip: using a laser level saved my butt on a tight roof set

Last week we had a job in Cleveland where the landing zone was barely 4 feet wider than the load, and the building next door was blocking my sight line something fierce. I usually eyeball the boom angle off the load chart, but this old timer I work with told me to clamp a cheap rotary laser to the jib and project the hook path onto the wall. Man, seeing that red dot line before the lift started, it caught a 2 degree drift I woulda completely missed. I checked the math after and that drift woulda put the load 3 feet off center, straight into a setback. Now I'm wondering, does anyone else use laser guides on urban picks, or is everyone just trusting their gut and the taglines more than I do? I feel like it's a small trick that could save a lot of headache, but I've never seen it in any manual or training video either.