Previous COD games have released last map pack a few weeks before the new release. So you get 2-4 weeks on them. So if your active ingame 2-4 weeks is a enough time to enjoy a go on them.
I have the season pass and will be playing the new maps without fail from there release day. Previously we have not played them to accommodate the 1-2 guys in clan who don't/wont buy them. For ghosts I will set up a TS channel for map pack players only and I will always be in there even if im alone. This caused a bit of controversy about playing with friends etc when I mentioned this in blops 2 but I missed out on 16 out of 32 maps for blops 2 and I don't want to pay for them this year and not play them.
I am not telling members to buy them or anything like that, just saying that I will only be gaming in lobbies that have the new maps.