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Adding comments is still slightly long-winded — you can't just click to type in a correction or missing word. Instead, you have to select the tool to insert text first, even if you've just typed something, which means you're mousing back and forth between the document and the taskpane. Sseeing the list of comments in the same place as the tools is more convenient though.
Acrobat X Pro includes some common guided Actions, but you can make your own by choosing tools and actions from this dialogue. You can't record what you do in a document to make an action, but it's very visual. For example, you can choose dialogue options (click the Options button for a step to open the relevant dialogue) and whether to apply the step automatically or wait for confirmation.
The options for creating Portfolios of multiple files are much less confusing. There are fewer layouts than before, with one grid you can edit rather than umpteen different grid layouts; the new layout styles, such as Wave, are stylish.