DS1 (just turned 4) had his op on the 31st. It went well, and they decided to take his adenoids out while he was under as they were also large.
They have play specialists at the hospital DS was at, and are great at explaining procedures, and distracting.
They used the 'magic cream', and he didn't notice the cannula going into his hand at all. Like others have said, one of the anaesthetists had DS in a little hug, with DS's arm around his back, while they found Wally together in a book. Weirdly, they gave DS gas after they put the cannula in, so that was what knocked him out.
He was very upset when he came round - crying hysterically :( I think it was a combination of being confused by the drugs, and overwhelmed by the situation. He ended up ripping the cannula out - not because it was especially painful, just because he didn't like it there. He's the same with plasters, etc. In the end, the iPad we brought with us calmed him down.
By the time he was wheeled back down to the ward he was calm. He saw the playroom was open, insisted on going in, and staggered around (drugs in his system) playing while DH and I tried to keep up/stop him bouncing into things. Within the next hour, he drank and ate 3 biscuits and a full lunch. He then ate 2 sandwiches and another couple of biscuits.
As he had sleep apnoea, he had to stay in overnight. It was a difficult night, mainly because he kept waking up and discovering he was attached to a monitor. He'd pull it off, the alarms would go off, repeat.
Now, 2 weeks later, he is almost completely recovered. He is so silent at night that it's a bit scary though!
DS still thinks that the hospital is great - he associates it with toys and fun, rather than pain or discomfort.