I'm 38, work in the City and had DD1 in May. I was always kind of ambivalent about babies and really wasn't sure if I'd spend my mat leave climbing the walls but so far it's been great. I've loved spending time with DD, who changes and does new and brilliant things every week, meeting retired relies (parents, uncle, Godmother), friends who are at home with kids (including new NCT friends), friends who work weekends and get weekdays off, etc. Have also managed quite a bit of household sorting out to make life easier when I go back to work in November (taking advantage of the fact that I'm home for deliveries, workmen, etc.).
I would say you'll likely be surprised how fast the time will go and how pleasantly.
The first few weeks will just be a blur trying to get the hang of sleeping, feeding and the after effects of labour. Definitely get in a box set of DVDs or two and some good books on kindle as you'll spend hours and hours feeding. But you should also be able to get out and there is loads you can do with a small baby, they are so portable. Look up which days your local cinema does Mum and baby screenings, think about who you can catch up with, etc. I also find DD is in a much better mood when we spend lots of time out: museums, art galleries, parks, cafes, etc. If you're lucky and have a baby who is not too colicky/refluxy it is pretty easy to get out (get a narrow light buggy and a sling and see what works): I don't think you'll get bored!
I think I have been lucky to have a relatively "easy" baby. Even so there are some grizzly days you'll get nothing done at all. But overall I've really enjoyed it and found "a change is as good as a rest" (and it's certainly not a rest!). I'm not really looking forward to going back to reality in November, as much as I enjoy my job. It has been lovely never having that knot in my stomach over an impossible deadline or difficult conversation looming!
Anyway, YMMV but definitely don't assume the worst, you may love it.
LT