Yep. Handwriting is one of my use cases. I also use the tablet to read PDFs of journal articles, and because a page displays (almost) perfectly on the big iPad screen, it is definitely the best device for me. I also use the iPad in portrait mode to write and read other things. I like the extra screen real estate, and everything (external keyboard, incase origami workstation, iPad, and stylus) packs nicely into my man bag. If I had a Mini, I'd still be carrying the bag, and would have saved a few ounces, but everything else would be less enjoyable, especially the blurry screen.
So, I also think it is really cool that people are enjoying their purchases and that Apple is having some success with the Mini, but I don't think their enthusiasm about "the future" of where the tablet is headed is warranted.
But, if they are right, and the Mini is where Apple ends up putting its effort (kind of how they have left behind the iPod in favor of the iPhone and Mini), then I'll just stop upgrading or switch to Android. For some of us, the little form factor has its uses (I have a 7" Nexus, for example), but the full size iPad is ideal (for our use cases).