Gotta say, I still have to bouncer mine, DD & DS almost 10 and DD who I 7. We get up at 7 to be out of the house by 8 for school. Invariably it is 10 past but we try to get to school on time, although registration doesn't close until 8:50 which is a life saver on those really difficult days.
DD's are more reliable than DS I have to say. I have to remind him to put pants on, yep, pants. Thats boys for you!
They also all get ready for school downstairs in the kitchen so I can bouncer/make breakfast at the same time. Weekends they get ready upstairs and I tend to start everyone getting ready at least an hour before we need to leave.
Not sure if that's just the twin mum in me, but old habits die hard!
I also have their uniform ready for them to put on on a morning, and if we are going to something important like say a christening, I would also get their clothes out for them.
Otherwise, we would have a chav, a pantless wonder and a tutu clad, welly wearing 7 year old.
And I wonder why I am down to my last marble 
Good luck,
H x