Long answer
Well, this may be more abstract than you care to know. Say average seek times are 0.100 seconds. So over the course of many seeks, the average should be 0.100. This implies that there are some seeks which took longer than 0.100 seconds and some which were faster. Still with me?

So it's just as likely that a seek taking 0.070 seconds on one drive, takes 0.130 seconds on the other. Well, the effective seek is now 0.130 seconds, even if the first drive did it in 0.001 seconds.
Seek times are different depending where on the disk the data is. I would assume though that raid controller designers are savy enough to know that and place data that was split at the same spots on both drives at the same time, else, as you correctly point out, seek times would suffer. Of course they cannot do anything about rotational lantecy, but I doubt that thats a lot. Ya maybe raid0 does have some access time problems, with Hard drives, but the Intel SSD has internal Raid0 and dosnt suffer from these problems. Still what you say is logical and should be given consideration when going to Raid0.

At any rate if the files are all tiny like they seem to be in wow raid is not much improvment:

Using 1 Mitron loading quake was same as NINE Raid0 Mitron SSD drives:

http://www.nextlevelhardware.com/storage/battleship/


Quoted
As you can see in all of the games, we are averaging a load speed increase of 68% over the Western Digital Raptor 150 compared to the single Mtron 16GB. The speed increase is truly incredible with this solid state drive. Now, please remember the Horsepower/Torque analogy that I discussed earlier in this article. Even though we are adding more horsepower (more drives and sustained throughput), latency and random access time (torque) remains the same. For Quake 4 we displayed an identical load time telling me that this game has a large amount of small blocks of files during load. However, for games that required a little more large file seeking on the drive we displayed minor increases in load time while scaling in raid. FEAR is the only game that actually scaled tremendously with more drives. When I loaded up FEAR on the 9 drive setup, Level 1 was pretty much loaded as soon as I clicked the mouse. Pretty incredible to say the least. Based on all of my results, not to mention having the ability to personally get a taste of all of these different test setups I am going to say the ultimate current choice in SSD technology is going to be a 2 X 16GB Mtron Pro Raid 0 setup for gaming.