When one has shot a bunch of images in succession or actual bursts via Continuous High it can be exhilarating at the time but then, yeah, looking at image after image after image which may show only tiny, minute differences from one frame to the next can be an exercise in frustration!
At least from what I've seen, though, and doing at lower frame rates(~10fps), even in a similar sequence it's funny how one can pop out and you say "that's the one!" Of course that's not always the case, and sometimes you can see where you missed a great shot in the delay. That's why anticipation and timing is still key even if you can machine gun.
Even my humble, now ancient D3s will keep going as long as I hold the shutter button down(it can do 11fps with AF/AE lock, or 9FPS without). I think I have it fixed at 100 releases, but never come close to that. It's funny, though, how people not use to a camera that can burst like that get a shock when they try to use it. I can do a single frame with it set to 9fps(although keep it set to single when not intending to do bursts since generally even a bunch of photos in rapid succession I can manage with discrete shutter presses. Even someone use to a consumer grade DSLR, though, often doesn't realize first of all just how fast a high end body paired with high end glass will focus, and then how little lag and just how fast a high end body runs. I have to be SUPER careful with my F5 set to anything other than single since I've had people easily burn a half dozen frames of film without realizing it.
To answer the OPs question, though-I have to agree with a lot of the sentiment here. If you find something lacking in your body now, look for an upgrade(I have a parallel thread running here now about options for upgrading my current main camera). If you can't point out something you'd like better, stay where you are.
My first DSLR was a Rebel XS(or maybe XT?). My selection of compatible lenses was limited since everything I had up to that point had been Canon FD mount. I was considering upgrading the body because I was disappointed with its detail rendering, but instead first put my money towards what I'd say is a "staple" lens for me in any kit-a 100mm macro. That was an eye opener to something I'd always know but needed to be reminded of-glass quality is critical. I found myself plenty happy with what I was getting. Now with some more DSLR shooting experience under my belt and realizing that yes, there is a world past ISO 400
(that's what I'd call a practical limit on film-it's pretty crummy past there), if I went back to that first DSLR I'd be unhappy with its high ISO performance. Also, that was my first AF camera, and now that I've experienced really, really good AF in a higher end body(especially attached to higher end glass, which makes a big difference also in focus) I'd find it difficult to use. Even if you're mostly a single point, static subject shooter, the difference in speed, lack of "hunting", and ability to actually lock focus in more difficult situation becomes addicting. If you start throwing any movement into it, modern focus tracking is amazing on higher end bodies.
Also, I'd always had a top LCD, and even though I got by without it I still missed it and am glad now that the cameras I use have them. My Df has a wimpy 2-line affair, but it still gives me thinks like the battery charge and some other stuff at a glance. It's also less relevant since a lot of what the top LCD would normally show you is laid out plain as day in the physical dials.
