920 owner here, and I feel the same, except that i simply haven't found i need a lot of apps beyond the nokia ones. The biggest gap for me is google, who don't want to support windows phone at all. Gmail over imap sort of works, but it is less than ideal.
Sometimes it's just a bit of annoying not be able to find a popular game available on other platforms. Even Android has this problem though. Hopefully the situation will change given Apple's current inability to develop innovative products. Let's just give it a couple of years.
I've recently bought an Experia Z2. Stunning piece of hardware, but I regret not have given WP a try. The usablity of Android is at best "quite Ok". And so much app crap ...