When basic things are hard, you have fun challenges addressing basic things. When basic things are easy, you are free to do more interesting things at a higher level. Web apps are easy. Making interesting web apps that do really cool things and solve serious problems - its as hard as any kind of app.

Your problem is that you're focusing on the same challenges and finding them easy, instead of thinking about what new things this simplicity enables. Step up a level, use the higher level tools to build better things - and you'll be challenged again. And you'll make better things.