I used to be an appoholic and had hundreds upon hundreds of apps installed on my iPhone. Maybe even close to a thousand at one point. I had so many on my iPhone 3g within a month of the App Store launching (about 60-80, which was a lot then) that it caused serious problems on the device—so serious that Steve Jobs himself responded to my email and put me in touch with senior engineers at the company to figure out what was going on. I was always buying the latest apps, especially if there was a sale and AppShopper alerted me.
Nowadays I hardly install any apps, and the only one I can remember paying for recently was Mario and maybe some Apple TV games a few months ago. It's just weird having been so involved in trying out new apps since the launch of the App Store that my interest in doing so has completely flatlined. I think a big part of it is the freemium crap we see everywhere. I just don't buy into that. The other part is UI/UX design in apps.
It was really fascinating to me as this new touch input method was catching on how different developers would construct their interfaces and gestures. It was always changing and improving. It even inspired me to seek approval and funding at work to design our own app. I feel like a lot of that magic is gone and things now are fairly regimented. The surprise and delight factor is gone. I also feel like I got screwed over by certain apps I paid for. There are a few examples of this, going back to Loren Britcher's Tweetie which was sold to Twitter and transformed into an awful app. There have also been several email apps that I've tried which always eventually get shut down or sold and then shut down. It's just not worth the hassle for me anymore to try to move away from the stock apps, which have themselves improved quite a bit over the years.
It's great that the App Store seems to be doing well, but I just can't help but feel underwhelmed by it now. I've got a solid foundation of apps and don't need much else.
I hear ya on binge downloading apps when the App Store was first introduced. Over the years, I slowly decreased the amount of apps I had installed on my iPhone. I still have about 50 apps installed on my phone currently, but I used to have pages upon pages of apps installed, some I look back on for no reason whatsoever.
Now I generally just have the apps installed that I know I will use on a regular or occasional basis.