I think as my 2 are 8 and 10 parents in my position with babies/toddlers without help think that having older kids makes it easier!
whilst the kids do need less help from you, other things change
they both go to clubs, but with the age difference the clubas are all on at different times/days
they both have sleepovers occasionally, but never at the same time, one is always here with us
I'm not trying to be patronising to others here, I hate it when mums of older kids say it gets harder and I think "oh yeah", but life gets harder trying to accomodate all of their interests
we do share runs to certain things, usually with grandparents of the other kids!
we've had 10 years of this, you think I'd be used to it by now!
oh and I do work, but I work school hours and evenings/weekends so I can be there for the kids as on my minimum wgae I can't afford childcare x 2
I've recently had to deal with an increasingly frail mum (with no family support - another thread itself!!) in her 80's, and meeting up with lots of newish friends round here who all have mums and MIL's at their beck and call and the contrast just really gets me down
as another poster said, which is very true, it'll be not long until my 2 are sort of getting independant and it'll get easier then