While working I had the good fortune to fly on 747s on multiple occasions (Pan Am, United, British Airways, South African Airways, and Lufthansa). I loved them all.
The company I worked for permitted first class travel for international flights. I was flying back from Frankfurt on one of my trips and flew on a literally BRAND NEW Lufthansa 747. The flight attendants were the prettiest ones on Lufthansa's entire payroll. I remember their beaming smiles as we boarded. The Captain even made an announcement of our good fortune. They were so proud of their new airplane! I remember it smelled like a new car. I could have sipped water with a straw out of the lavatory sink and not fallen ill.
Last time I was on a 747 was in 2008, flying back from Cape Town. For me at least, flying on a 747 never got old.
Scott