SATA and SATAII are only interfaces capable of recieving up to 1.5gb/sec and 3gb/sec. A hard drive needs to be able to access data fast enough to fill up the interface bandwidth, and as it stands, a 10,000RPM drive will not transfer data at 1.5GB/s, plain and simple.
You won't see any difference between a hard drive running on SATAI or SATAII, load and seek times are all determined by the rotation speed and cache size of the drive, not the interface the drive is connected to.