Very much depends on your individual horse. Is he generally quite sparky?
I must admit mine is pretty keen to load as he has learnt that the box means he is going to a party! In previous seasons he has been quite wound up when we got home but this season he is very calm, just pleased with himself! I found it helpful to chuck him out for half an hour to let him chill out.
One of mine thinks/hopes he is going hunting every time he travels. But when he gets out the other side he often breathes a big sigh of disappointment and turns back into Dope on a Rope