If you've got a single external hard disk or DVD-ROM drive on USB 2.0, the USB bus isn't the bottleneck. Even while hard drive storage capacity has grown by magnitudes, the throughput speed is still stuck close to what it was more than a decade ago. SATA helped a little, but not nearly enough.
USB 3.0 will be useful someday, and the earliest beneficiaries will be external multi-drive RAID configurations using 4-6 volume stripe sets. Even most of the solid-state transfers (flash devices, either standalone or embedded in cameras as so forth) run below USB 2.0 speeds because of inefficient memory controllers or poorly-designed file structures.
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