Keeping your checkbook balanced is very important. A skill few people know how to do correctly or at all for that matter. (To be honest I couldn’t even tell you where my check register is. Just check my online account every couple of days against what I purchased to make sure everything is kosher.) However, doing so at the register is not the place to do it. Take your receipt place it in your check book and deal with it later. Do it in your vehicle if it something that will bother you that much or better yet wait until you are in the comfort of your own home and can file away receipts in a timely manner.
If you are the only person at the register I honestly don’t care, but when there is someone waiting or multiple people for that matter common courtesy dictates you get the hell out of the way. Whomever is running the register is most likely not going to ask you to move. (No one wants the negative customer service review.) It is just easier to let the person(s) behind them shame them into moving.
This all ties into a couple of things I have mentioned in the past. First, the post about keeping your head on a swivel. Using checks is a time consuming process. Wherever you are using them is most likely going to be busy so get it together and get out of other customers way and stop tying up the person running the register. They most likely have three other tasks running through their head that they know need to be completed yet have to wait for you to hammer out a check.
Secondly, I have pontificated about how checks are an archaic form of payment. There are just way to many other payment methods that exist in which your bill can be settled up with. Most of which are safer and easier.