Good for you for recommitting! I know I always feel better and like "it's official" when I make a thread on here about how it's time to get back on the pony.
You and I have similar numbers (similar heights, starting weights, goal weights), and I absolutely experienced the most significant changes when I was losing from 160 and down. I was carried through the first half of my weight loss by the excitement and fresh motivation of living a new lifestyle. Like many people, my first pounds practically melted off. So it was encouraging to coast down the scales and see good numbers every week, but at the same time, I didn't notice many big changes. A few friends commented, but I was still in my size 12's (albeit they were loser), and I didn't really feel like I had gone from chubby to thin. Around 155, I got to my plateau. Suddenly just "eating better" and "cutting back" wasn't giving me results. I had to figure out a real plan (calorie counting), I had to exercise, and I just had to work harder for each pound lost. In a way, this remotivated me all over again. And where I no longer had the big losses every week, I had much more noticeable changes in my body. I went from a size 12 in January 2010 to a size 6 in literally two months. I was in 4's, then 2's, and finally 0's by May. I DID have to dig in and work harder for the last half of it, but like you said, it was so much more fun.
So good on you for getting back on it. Enjoy the fresh motivation!