Edit: I started this before Eske's post, got interrupted, but will post anyway. :D
Strangely, this is not my experience. It may be what I do on my Pro and Pro1x. Mostly I work with text-- writing and editing, I browse the web (research while writing, a lot of forums, and such), do email, notes of various sorts for writing, and calendaring, scheduling. Keeping my display size at the smallest setting (font size one click bigger), which my 71 year old eyes have not trouble with, I find almost no app that doesn't do well in Landscape. I have a third party app to force a fixed rotation.