Over ten years, plenty. We should not be confused by the fact some familiar elements stay the same over time. Excel still has rows and columns, Word still has buttons to format your text as bold, italic and underline (Although Microsoft got some bad review for their implementation of the "Ribbon").
I forget when Claris moved the status area from the left hand-side of the screen to the top of the screen to mimic browsers and other apps users are familiar with, but with our 16x9 displays, I kind of wish they kept things on the left. Anyway, like with anything, some new features may be useful to you, some others may not, some may be more cosmetic.
I see studio as a "side-car" to FileMaker (or Claris Pro rather). It is still in its infancy and even if the wow factor may not be present at this time, there are people who can have use cases that are a good fit for it, and I do not exclude that over time, it may get more and more that will make it attractive for more use cases.
It's funny to see the kind of reflections we have today when a fair number of developers were not all that pleased, back when FileMaker 7 was introduced, for the new software felt too different from what was familiar (I recall some people asking for a list view of their solution's relationships).