What I find more annoying than people hogging the middle lane is…
… people complaining about people hogging the middle lane.
It's rubbish, people do it and they shouldn't. They're very naughty.
But you'll see it every time you drive on a motorway, so it's predictable and not something that should wind you up so much.
It's discourtious and shows that you're probably not a particularly competant or confident driver, but I get much more annoyed with people on phones no matter which lane they're in, and with tailgaters.