I laughed at a laser level for trim work until my crown molding on a 12 foot wall took 4 hours to fit
After fighting gaps on that long run I grabbed my buddy's $99 laser and the next 3 rooms went up in 40 minutes total, so now I want to know if anyone still does crown the old way on purpose.
The part people miss is that a laser does not help if your walls are out of level to begin with. On that 12 foot run you were probably fighting a ceiling that dropped an inch from one end to the other, and the laser just showed you that faster. The old way, you find the low corner, snap a line, and shim or scribe the crown to match the mess. That is why some guys still do it by hand on purpose, not because they hate tools but because a laser assumes the room is square when most old houses are not even close. In a new build with good framing, the laser wins every time. In a 1920s place with plaster and a sagging joist, you will still be cutting and fitting by feel. The trick is knowing which room you are standing in before you reach for either one.