You my dear are a hippocrite. Say it with me class Hip-po-crite. You are ticked off that the store staff is rushing you but what you fail to realize is that the employees have lives too. They need to get home at a safe hour, they have things they need to do after work too. You cut into their time, that they aren't being paid for and you expect them to just smile and take it. I don't think so.
Just because you can come in at 9:45 and do an hours worth of shopping, doesn't mean you should.