OK, don't want to panic you - but seriously DON'T GET THERE TOO LATE!!!!!!!!!!
We checked in at DTD at around 8.30am and the air hostess told us to get to the gate at around 8pm (our flight was at 8.40). We had to drop the car off at 5 anyway so we were at the airport at five. We used Budget and there was a massive queue, only one guy doing the paper work, a man behind my dad was going to miss his flight to Gatwick because the man was taking too long. So 5.30, we are sat relaxing in the airport. 6.30pm we get washed and changed into our clothes for travelling. 7pm, Dad has a cigarette and we all head through security. Mum gets stopped, so it takes around 20 mins to get through. 10 mins on tram. Wrong tram. Go to right tram and get to right departure lounge at around 7.45 ish maybe a bit earlier. Realise because of the tram fiasco we have to hurry so Dad goes to Duty Free for Baileys for Granny, Mum to Starbucks for Tea to Go for the three of us, me to newsagents for water and sweets for journey for us. 2 seconds later Dad is stood in middle of departure lounge SHOUTING my name, mum and I run out of said shops and go WHAT? He goes "We HAVE to go, we are the only ones who aren't on the plane!!!!!!!!" So, pandemonium breaks out, I manage to get my stuff but mum and dad can't get theirs and we rush to the gate. Turns out Virgin decided to leave at the time they should have been boarding as they managed to get an earlier take off slot. We got in around 45 mins earlier to Manchester. But they didn't make any announcements at MCO. Before I left the UK, I had checked to see what seats were available and the plane was pretty much full. When we got on it, there were a few empty rows so people must have missed the flight. It has happened to us before where we turned up on time and we were told we were late and couldn't board and we literally saw our plane take off 45 mins later as we stood at the airport in disbelief. It took us a week to get flights back home!
So I would say, get to the gate at least an hour before the flight, Security an hour before that, 30 mins for car.
I also like to just relax at DTD and people watch!