I'll have to give it more time but so far I like the change.
Typically I have dozens of tabs open, so at first blush it might seem that the redesign wouldn't work for me at all, and that would be true if I didn't adjust my tab habits.
What I've done is swept those dozens of tabs into a handful of purpose-oriented tab groups. I don't really need all of those tabs open at all times, all I really needed is somewhere to put them that's more ephemeral and has less management overhead than bookmarks. As a result, most groups only have a few tabs open and pose no problem with the new UI.
Theoretically, this approach may also have the benefit of improving focus. Because online message boards and the like live in my "general" tab group, when I'm switched to my "programming" tab group I'm soft-locked out of those sites by way of reduced accessibility, making it harder to drift off of my current task when googling for documentation, etc.