Hi Greecelover - we followed the GF routines as well and they worked fabulously for us as well. But I do know what you mean about the same same same all the time. To be fair, I think its like that for most parents when their kids are still so young, regardless of how they deal with sleeping and routines etc, and the only thing you can do is get out of the house as much as possible to keep your sanity. As TheApprentice says, there is just so much constant feeding/changing etc - but give it a few months and once your LO is walking, feeding themselves better, communicating with you more, it all gets SO much easier.
Also, you're not following the routine for its own sake - its there because by those times your LO is ready for a sleep, so its not as if there's really a way round it (apart from to have a screaming overtired child, which would be way worse). If there's something special you want to do, then don't be afraid to change the routines either - you'll have an idea of how 'flexible' your LO can be already I guess and what you can get away with before it all goes pear shaped, but they do get more and more flexible as they get older.
My thought is, what do you really want to do that you can't fit round the routine? Is it really that life is just a lot more restrictive now that you have a LO? Because that aspect of life really does take a lot of getting used to, for all parents I think. I found it really hard, and it must be even harder if your DH isn't around all the time at the weekend. Are there other friends you can arrange weekend things with, invite over for lunch whilst LO is asleep etc? Also, can you get some childcare for your LO for a couple of mornings or whatever a week, so you can have some grown up time by yourself (this one is a godsend if you can afford it)?
FWIW DD is 18mo now, has finally dropped (been forced to drop because I was fed up with it!) the morning nap, and life seems so much more flexible. She sleeps fantastically (6.45pm to 8am, so I even get a long lie in now! plus 2-2.5hours at lunch which is a great break, especially as pregnant again) and is totally lovely, (biased I know...) and I know many of my friends would kill for their ones to sleep as well as DD. She even helps me tidy up now! Shame we've got another one due in a couple of months and have to start all over again.... (only joking, looking forward to it really, kind of).