Kudos!

[Justin R. Smith]

I upgraded to 6.0beta2 and was pleased to notice that file transfers to 
and from my memory stick seemed much faster than before...

demsg revealed

da0 at umass-sim0 bus 0 target 0 lun 0
da0: <SanDisk Cruzer Titanium 2000> Removable Direct Access SCSI-0 device
da0: 40.000MB/s transfers
       ^^^^^^^^^
da0: 495MB (1014784 512 byte sectors: 64H 32S/T 495C)
    

In 5.4 stable, this was 1MB/s transfers!
It looks as though USB 2.0 really works!