I was building a garden wall and got into a rhythm. I didn't stop to check my level until I was done. BAD idea. The whole thing leaned to one side, and I had to rebuild it. My big lesson? Pause and verify alignment after laying each course. This keeps everything straight and avoids rework. It's now a NON-NEGOTIABLE part of my process.
Do you really need to check after every single course? That seems like overkill and would break your flow too much. On my jobs, we often set up a solid guide line at the start and then spot check every few layers unless something looks off. What type of wall material were you using that made it so tricky?