This is my experience almost exactly (iOS user). Since then I've started uninstalling all of my apps that have a reasonable mobile web alternative. I'd held on to them from the days when the mobile web wasn't so great.
It is interesting that many people don't know that most of their apps have perfectly good mobile web apps too. With the advent in web technologies and developers' focus on best practices the web apps have become very responsive. Personally I got tired of downloading and installing and signing up for apps only to find I didn't use them very frequently. Then I saw their web apps and they worked great. Now I don't have 100 apps on my phone. Just one that takes care of going to all those web apps quickly and easily. Full Disclosure: I built that one app, get@ app.
I've been doing exactly this too over the last few months. Safari iOS is so fast now on the iPhone 6s that I find the mobile sites faster than the apps in most cases.