From other "just a few apps on a daily basis" users I've seen, they tend to use the default apps as well. It's not a random cross section of the 200K apps in the App Store.
This is a variation of m0nitaly's point: I would say "except for Instapaper, Reeder, and Twitter..." and Jasber would say "except for Rdio and RunKeeper..."
Even if apps 1-10 are native, I'm hanging onto my iPhone for numbers 11 and 12. The native iOS experience is great, but those two or three non-native apps make it sublime.
On a side note (not related to current enjoyment of phones) I really think it's not too long until the only things that are necessarily apps use lower hardware features (GPS, compass, camera, Shazam, game graphics), with even some of those possibly moving into the browser (disclosing location to sites already exists on desktop, Google just launched voice search on their desktop search).
I also think its a bit disingenuous to put the Twitter app (not an alternate third party Twitter app) in the same category as the others. Right now, a new mobile device would probably have a Twitter app and maybe even a Facebook app as a "native" app. When I got my phone Twitter and Facebook was already installed on it, equally presented alongside all the "native" apps like Googles, Maps, Music, Navigation, etc.
I disagree. I have friends who love Tiny Wings, Angry Birds, Pandora, the DC Next Bus app, SimpleNote, NPR and Fruit Ninja. Most of these are iOS-only, and those that are not have abysmal Android versions.
As for Twitter being native: are we talking about the Twitter for iOS app? Because the iOS app is indispensable relative to other options.
Both Google and Apple have built the type of platforms being referred to when casting doubt on the future of MeeGo. The central feature of those platforms, up until about six months ago, was their capability to run applications. This is shifting quickly to the ability to store data in a way that is transparent to the user.
Google can, right now, give you seamless, transparent access to documents on a phone, tablet, or desktop computer with no thought or action from the user outside of logging in and browsing to the location of the document. There is no syncing. The same is true for email, calendar, and contacts. When iCloud ships this fall, Apple will be in the same position. What would it take for Nokia to bring MeeGo to that point?
This is "the platform" that I can't see Nokia building, and I believe it's going to set the bar for every major player in the space in the coming years.
You certainly have a point, most apps are downloaded then never used. But I think everyone's "few apps" are different with lots of overlap in the apps you mention.