Well the "problem" with this theories is that they DO know how they did it. The granite quarries are just really far up the nile. They used ships to get stones from there to the building spot, which isnt really far from the nile (maybe 1 km's straight).
The most fascinating part about the pyramids I think is the fact that they are almost IN the city. It is literally built around it. The people have lived thousends of years beside them. They are accepted as something completely normal, and absolutely not as something to break your head over.
I had dinner while looking at the giza plateau