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It appears slow because it's such an enormous aircraft. Here's an example - the C-130 isn't a 747, but it's a decently large cargo aircraft. Here it is next to a C-5
Consider how fast the C-130 would have appeared had it been going down same runway.
Also, if you ever get the opportunity to see C-5s doing touch and go's, they definitely seem to just float in the air.
It appears slow because it's such an enormous aircraft.
I can back that up. I have seen C-5s take off empty and they seem like they are barely moving. They hang in the air and are clearly visible for so long. If you have ever been around one or in one you will be amazed.