Yes it did change things, but actually I preferred it in the end (took me a while to get over the fact that I no longer had 2 down-times) because it meant that I was left with mornings completely free and afternoons free. We had coffee group at 10am and I made sure I left by 11am to get him home for a nap (it was a bit touch and go since he really was tired sooner), so I stopped having morning play dates for a while (except our once a week coffee group) and just remained with filling up our afternoons since he was basically awake from 1-7pm (most of my friends lo's were going through the same thing so it fitted in well). Unfortunately for me, when he did finally stretch his nap time out to 12.30pm it was only once my baby was born, so now I only have a 1hr gap in the morning and a 1-1.5hr gap in the afternoon to get out of the house.
Oh, and lunch dates - nope don't do them anymore.