This is a good question. I took the MCAT 8/03, and although at the time I thought I was prepared I felt much more so this time--I could really tell the difference. I do think the Kaplan course helped in this way, at least in terms of the practice tests. Last time, I studied on my own, and I took several full-lengths under timed conditions, in different locations (not just at home). But taking the Kaplan full-lengths each week for 5 weeks , with the proctors and other students, did provide a more realistic simulation, and going to the real thing yesterday more or less felt like just going to another practice test (with a little more nerves involved).
I also liked the test center better this time. When I took it last year, they split a large group into only 2 rooms, so there were probably 40-50 people in each room. The desks were small and uncomfortable, the ventilation was crappy, and the proctors not very helpful. This time, a similar size group was split into 4 or 5 rooms, with comfortable office-style chairs and huge desks, and the proctors were really friendly. Portland people, take the MCAT at U of P!
As for the test itself, the PS seemed similar to AAMC 7, and I felt okay about it (hopefully my perception of this section was accurate, as this is the part I'm most worried about). VR also seemed comparable to a lot of the practice tests, I would say average in difficulty. For me, BS was the surprise--more difficult than I anticipated. I finished this section on AAMC 7 with 20 minutes to spare, but on the real thing there were a lot of confusing questions and passages and I felt unsure about more of the answers that I put down then I am comfortable with. Last year, I felt bad about PS (got a 7), okay about VR (got a 12) and okay about BS (got a 10). So we'll see...