There is still a lot of ground to be covered here isn't there?
It's all about ingrained assumptions and perceptions - these comments are give aways that no matter how equally we strive to parent, what women do is seen as 'normal' whereas what men do is seen as above and beyond 'normal' realms of expected behaviour (aren't you lucky he's so involved?) or seen in a patronising manner (he's a man yet he does so well), and therefore generates praise from others.
DP & I parent pretty much equally, though we have different roles. I am much more of a driving force, organiser, catalyst in our family. I also thank people for stuff naturally - so when DP cooks I will thank him for the lovely meal (if it is lovely - some days it's simply "thank you for the meal"
), which is what I was brought up to do - to appreciate and genuinely thank people. But DP does not always do the same when I cook. 
I often have to bite my tongue to stop myself from thanking him for doing stuff with/for the kids or around the house - not because I don't appreciate it, but because he is simply doing his job as a father and i don't get the same thanks for doing the same things as a Mum. I do feel mean sometimes, but I am aware of the message it sends for ME to thank HIM for simply being a parent. So I strive to show him I appreciate him, without thanking him for doing XYZ (usual parenting/house jobs). He lets me know he appreciates me, but he doesn't do the thanking for the daily bits and bobs. I've had to change what seems to come naturally to me.
I will admit to internally being thankful that DP is how he is though (as I couldn't do it any other way and don't fancy being a single parent) - compared to pretty much every other family we know (those where I am aware of the parenting balance), we work really evenly and fairly. In one way this really surprises me. However I know that our parenting balance is a mix of him wanting/loving/needing/expecting to be very involved and me laying down boundaries and being very clear (bolshy/mouthy) about my expectations of us as parents from the outset.
I'm really surprised at other female friends who carry the bulk of the parenting, and are resentful but resigned about it and don't push/voice their concerns (he's the main breadwinner therefore ....., or he's my soulmate therefore ....., or I want to do it therefore ....., or he's worked all week therefore it's OK for him to be absent drinking/sport/etc all weekend ......, or I don't want to upset him/cause a row....... etc). I don't see how long a healthy relationship can be sustained when one person is swallowing resentment and smiling desperately on a daily basis striving to "be OK" and enabling the other parent to swan around without parenting responsibilities. How long can a family remain healthy when one parent takes advantage of the other and the other is resentful? These are the fathers I see being praised for their meagre involvements with parenting - it just enables the divide and resentment further.
One last point is DP finds hands on parenting extremely rewarding as do I. Whereas many fathers around us, seem to perceive it as another job/chore to be shirked out of if at all possible, and their partners enable this. It's really sad. Yes there is some dullness around parenting/housework, but they are also missing out on so much.
RedBlanket why don't you and your DP do alternate weeks with the swimming?