I generally don't have an issue using a self-checkout lane...
But it really depends on what I have and how much I have.
If I have a huge cart full of stuff, I want to go through a lane with a belt and a large bagging area. I'll even bag my own crap to help the cashier if a bagger isn't available.
There's nothing worse, though, than having a full cart and being forced to go to one of the self-checkouts with a short belt and a bagging area that will accommodate 2 or 3 bags.
Even worse, at the store I shop at, the whole time you're scanning the register is screeching "PUT YOUR SCANNED ITEM IN THE BAGGING AREA!!!" about 1/4 of a second after you scan it.
Then, as often as not, it will screech at you "REMOVE THE UNSCANNED ITEM FROM THE BAGGING AREA! SCAN ALL ITEMS, YOU *expletive deleted*ing THIEF!"
The system is ratechety and annoying as all hell.
I'm not sure if it was in this thread or not that I mentioned it, but not long after the store implemented those changes to the self scanners one guy had his fill.
He yelled at the top of his lungs "*expletive deleted*ck THIS *expletive deleted*it!" or something like it, slammed what he was trying to scan down on the scanner with a HUGE crash, and walked out on a full cart, full belt, and bull bagging area.
At the time the store had one, maybe two, manned registers open, but they both had lines.
But they also had a gaggle of associates standing around the service desk laughing and chatting and otherwise being absolutely useless. The had to reshelve all that guy's stuff.