Mr Bennett,
Your 450 miles of not much includes:
Barwon Heads, Port Fairy. The Great Ocean Road, some of the best farming land in the country and the Hampden Football League. Wash your mouth out...
Sean Walsh
I've just been to the dentist. He washed my mouth out.

. The farming land is great, if you take the scenic coastal route. Otherwise, there is quite a bit of desert.
Also, who/what is the Hampden Football League?
Otherwise, I agree. There are some lovely ways to travel between Melbourne and Adelaide, if you take the long way. The Bellarine Peninsula (13th Beach, Dunes, Barwon Heads etc), Port Fairy, the Great Ocean Road (which IMHO is superior to the drive from Monterey down to LA), Millicent, the Coonawarra (for those not in the know, read world-renowned Bordeuax equivalent cabernet sauvignon). Lake Albert is also getting good reviews as a low cost course (no bunkers, I think). It would take a few, lovely days to do this. I plan to do it soon, but when?
My reference was to the Dukes Highway 8 hour dash between adelaide and melbourne. Yes, there is Horsham about half-way, and a lovely set of par 3's at Bordertown (great greens). Otherwise, there is the grampians (complete with windmills these days) and the Ballarat by-pass.