IFR through Florida - airways?

I've filed direct through Florida, and gotten it.

I have run into problems when I've tried changing routing in flight.
ATC accommodated me, but it was apparent that they were handling a lot
of traffic and the re-route used up a lot of their scarce time. Gave me
a lot of airways and waypoints. I'd recommend filing the way you want
to go.

Lots of airplanes crammed into a small space.

Rich

Patrick Mayer wrote:
I've been flying there once. Filed down the east coast, although there was a
Shuttle landing at that day and the airspace was supposed to be closed until
around my crossing time there.

Got cleared as filed, waited for the rerouting - which didn't come. I ended
up flying just next to Cape Canaveral with the Shuttle still parked on the
runway... beautiful sight!!

My understanding is, if you file "direct", you'll most likely get a reroute.
Any other experiences out there?

Happy flying,
Patrick