What is take lanes?
Stacked rows holding multiple recorded takes on one track, letting you audition and select between them. Most modern DAWs create them automatically when you record over an existing region.
Lanes are only as useful as their contents. Four complete passes are far easier to work with than twelve fragments, which is largely a function of how many times the session had to stop.
Building one final vocal from the best parts of several takes. The editor chooses per line or per phrase and crossfades between them, which is far quicker when every take was sung with consistent phrasing.
Looping a section and recording a new take on each pass, stacking them in lanes to comp from later. Every lap starts at the same point, which makes it the fastest way to gather usable options.