2. Socialising. I avoid the drinks, dinner and any other social function I can. Not that I don't talk to people I know during the day...but non-stop interaction all day and all night is a bit more than I can handle.
3. People who are disrespectful to the speakers. Texting while someone is speaking is just rude. As is leaving after a speaker delivers their opening slide. If you are room-hopping to hear someone else's paper, then leave before the speaker starts. It's been many years since I presented at a conference, but trust me, it's very off-putting.
4. Carbohydrate overload. I realise that giving people lots of cake for morning tea and sandwiches made with huge chunks of bread is a filling option, but three days of it is a bit much. More fruit please! The hot lunch on day one was good but the food quality went a bit downhill from there.
5. That when they are over, you have to go back to the daily grind and deal with all the unfinished stuff from last week...