Yes, there are trakmos which are trackloaded and most of them (if not all) are loading at absolute addresses.
Also there are some demos that are loaded by Amiga DOS filesystem but needs to be loaded with specific condition, like one drive (DF0: only), chip only, KickStart 1.2 only, ... Most of them (if not all) are loading at absolute address in memory.
Those KickStart x.x only demos are made that they use direct calling of function in KickStart ROM. If, for example, it calls directly KS1.2 functions, same functions are on different address in other KSs and it will call wrong code in other KSs than KS1.2 and thus will crash. I think that those are rare demos/intros.
You know that you can speedup floppy disk loading in WinUAE. But remember that some programs which depends on timing won't work or just partially work. In "Floppy Drives" exists section "Floppy Drive Emulation Speed". On the right is acceleration up to 800% and on the left is "Turbo" mode. Just remember that some things won't work with floppy speedup or they will work maybe with lower disk speedup.
There are some demos (and maybe some games) which uses floppy as sound device.
For those don't use floppy speedup.