Similar situation here!
I've been a SAHM since DD1 was born 9 years ago. Have worked part-time in a nursery, and am now doing LOADS of voluntary stuff in a school alongside my OU course as I really want to get into the TA/LSA side of things.
DH, on the other hand has gone from strength to strength in his career. He commutes into London daily (almost 2hr door to door each way) working as an IT Consultant for an International Investment Bank.
His work does involve foreign travel (not that much TBH - probably every 12 weeks or so, last trip in Sept. to Singapore). In January, he's off to Prague.
He leaves the house at 5am, getting home between 6.30pm and 10pm. He was out last Thursday in London for a "do" and stayed overnight on Saturday in Surrey for his boss's 40th birthday bash. (I was invited - couldn't go as 1. my mum is away and she's my babysitter, and 2. I really didn't fancy it!).
He does a lot of work from home in the evening - BUT he does devote his WHOLE weekend to me and the kids (even though he was out overnight on Sat. - he didn't leave here until 6pm on Sat. and was back home at 9am on Sunday).
It used to bug me loads when the kids were small and caused many arguments back then. However, the main difference now is his boss is VERY understanding (has 3 kids himself) and encourages DH to take the odd day off regularly (and doesn't include it in his holiday allowance). As it happens, DH is off on Friday.
Before we had kids, we always knew one of us would stay at home with them - and as I would never in a million years, be able to earn the amount DH does it made sense for me to stay at home. The advantage being now is with the kids off at school - I am in a position to do WHATEVER I want with my life - hence my voluntary stuff/OU course.
It is hard and what Ponygirl says
"I work very hard at home, and it's my support that has helped him get to where he is now, but I don't get the recognition" is very true.
Sometimes I comment to DH that no-one will pat me on the back and say "well done". However, when people compliment us on our children, DH will always say "ah, that's down to Slinky - she's fab with the kids" (particularly when I kick him to remind him )
But the best thing in it all is when the kids say "you're the best mummy in the world, you always do nice things for me" (DS1 over the weekend), and "I'm really glad you're always there to pick us up from school" (DD1 last week) - things like that make it all worthwhile