iOS 8 is really amazing but it may not be apparent yet if you're not a developer using the new API's. Externally, there are few things to get excited about -- quick reply and some enhancements in Messages, actionable notifications, etc. but it's not like the huge visual jump we had in iOS 7.
Once you see the new APIs in action though, which for most people will be once iOS 8 is public and they hit the App Store, you'll see some really different things!
A great example is the 1Password beta I'm on which uses the 5S sensor for authentication in a Safari extension. Other apps I'm running allow manual control of the camera and direct plug-in of filters and editing tools directly into the Camera app.
In many ways, this seems like the biggest change Apple's ever given devs, allowing access to previously walled off parts of the system, so "Stay Tuned!" because you're only currently seeing part of what the iOS 8 experience will be.