I plan to have removable casters on both of my 115" cabinets. They're about 55lbs each and for long distance it is much easier to roll than lift. When there is a carpet or door frame lip it only takes a quick tug on the handle to get it up and over.
Theoretically the surface contact between the caster wheel and the floor is an infinitesimal line
In all seriousness it is completely arguable that there are certainly more losses in a caster than there are in a 1 inch diameter rubber foot common on bass cabinets. The caster has bearings, rings and several floating parts. The vibrations need to physically transmit between several extra "interfaces" than is necessary when you're just talking about feet. whether or not these losses account for any noticeable decrease in the low frequency response of the damn floor!? who knows.