First time around - induced. Nothing happened for ages and 24 hours later was just 1 or 2cm dilated. Apparently the midwives were talking about having to do stuff to speed things up as they were beginning to get worried. Finally got to about 4cm and they reckoned it was going to be another 8 hours. I was begging for an epidural as I was in so so much pain, they kept saying no, it was too early. The also wouldn't let me move around as much as I felt I needed to.
A few minutes later and I started to push... at which point they told me not to be ridiculous, it was far to early to push when I was not even halfway dilated. And with that, a massive whoosh - turns out my waters hadn't broken, ds1's head was blocking any water coming through. He obviously got to a point where they were able to break and he came out a couple of moments later, swept along on the wave so to speak
. They had then ascertained that I was actually fully dilated, and that it must have been really really painful to have dilated so quickly, why didn't I say something.
Stunned, I just asked them wtf did they think I was doing when I was screaming in pain and begging for an epidural - had it not occurred to them that I was actually in real pain and not just acting in the hope of getting early pain relief 
Second time around - different hospital. Couple of weeks before due date, had gone in for an outpatient appointment at midday. Contractions started coming thick and fast - they were soon at having a minute between them and then it was down to just a few seconds between them to get my breath and regroup before the next one.
Saw the consultant who said that I might be in early labour or having braxton hicks, to go home, relax, and come back in a few hours, then dismissed me. I staggered out into the waiting area, the midwives were rushing around to see if there was a birthing kit down there just in case the baby came there and then, while ringing the porters back up to hurry one up and the delivery suite to make sure they were getting a room ready for me.
Porter got there and took me to the delivery suite (other side of hospital - felt a very very long way!), barely had time to take trousers off and get on the bed before ds2 came along. he was cleaned up and in my arms less than an hour later.
Never did like the consultant and was gobsmacked when I was having such massive contractions that he could be so dismissive of them - midwives on the other hand were fab and knew exactly what was going on. Shortly after I gave birth, turned out the consultant got severely reprimanded for several cases in the hospital where his care fell well short of what it should have been, including ignoring experienced midwives raising concerns about timings of when interventions should take place. Can't say that I was surprised but sad to have experienced it for myself (thank god for the midwives who were completely the opposite and lucky that it wasn't a dangerous birth where his advice could have caused serious problems).
Friends who are doctors have all said that rapid births can be incredibly painful - just amazing that it doesn't seem to be recognised for so many women who go through it - and that they're not even given the benefit of the doubt 
