I wouldn't say I absolutely love it but nor is it an ordeal and there's many aspects I do like, and I've certainly learnt to enjoy it more over the years (am quite introverted and used to get a bit stressed so I get where you are coming from). Off the top of my head:
-The kick up the arse it gives me (and more importantly DH who can be a bit lax when it's just us) to really get the house looking its best, it's never filthy or anything but it's amazing how when you're really motivated a 30 min dash around can deal with those little piles of stuff or slightly grubby corners you've been putting off. DH's family are very much of the 'dropping by' persuasion so I sometimes don't get much notice they're coming which used to slightly stress me but now I actually quite enjoy the 20 min sprint cleaning.
-The chance to spend time with people I love - we don't really host other than for close friends and family, I can see that if it's more of an obligation it would be more like work or a chore. We like to play board games and quizzes etc with both families which I get is not for everyone but to me is really fun.
-I really like cooking but it's only me and DH at home now and we're both trying to eat healthily so a lot of the best recipes and treats are saved for when we have guests - the food prep can get a little hectic especially if it's a lot of people or we haven't had much notice but I overall enjoy the process and certainly eating the results!
-DH's family in particular are very generous with their 'host gifts' (they're not from the UK originally and gifts are a big part of their culture which they've based on to the second and third generations) - we get lots of lovely flowers, bottles of wines, boxes of chocolates or biscuits every time we host, far more than can be used up that day so we get to enjoy for days afterwards.
-The moment when they all leave and you can relax, undo the top button of your jeans/take your bra off and flop down for some alone time! As an introvert I of course have that feeling of relief when leaving any kind of social event too but unlike when you're at someone else's house or at a pub or restaurant you don't have to get yourself home after. Means no need for designated driver either (not that we'd be getting trollied either way but can have a couple of drinks without worry).