I certainly wouldn't choose to travel with the likes of Ryanair either, now that I can afford to spend a bit more and prioritise comfort. However, for a number of years I travelled with Ryanair at least once a month and experienced no real problems. If I still lived in Europe and didn't have much spare cash, I suspect I'd still be flying Ryanair and Easyjet and I'd generally be ok about it!
On quite a few occasions, I have had the unpleasant experience of boarding a plane and then finding it doesn't move anywhere for a long period of time - all with full-service carriers though, as far as I recall. Two such incidents spring to mind - one because it was just 2 weeks ago with
Etihad. After boarding was completed, we sat at the Gate for a full 90 mins with no real explanation, and then joined a queue for take off - ultimately not getting airborne until well over 2 hours after we boarded. Fortunately I was in J getting well looked after by a friendly FA with a nice bottle of shiraz, but I'm guessing the people back in Y had a slightly different experience. The other incident that I remember well was on an MH flight from KUL where I had connected en route from Oz to DUB. I was in Y, and on that occasion we also just sat there for about 2 hours without the plane moving. I distinctly remember not being offered anything by the cabin crew (although I wasn't refused anything either - I didn't ask), and it was extremely warm on board. Eventually we were asked to disembark and wait in the terminal for another 3 hours or so while some maintenance was performed. I then missed my connecting flight in LHR and ultimately arrived in DUB about 12 hours late, to find that my luggage had gone missing!
These things happen from time to time, with all airlines. It's very frustrating when you're caught up in it, but worse things can happen. Anyway, my main point is that anyone who thinks this is a LCC phenomenon has just been lucky so far