If we were discussing Hiccup's first Mock-up (from last week), then I'd agree wholeheartedly. But I have to offer a dissenting vote for this last one - I don't see the need to move anything around so drastically, especially after all the effort that already went into the "Import/Save/Edit" layout.
Adding the seven text lines with checkboxes takes up more vertical space. Space that isn't really available when leaving the rest of the panel the same.
So I thought reshuffling the larger buttons—what makes this possible—would be a good solution.
And as an added benefit, the groups of buttons are now very nicely separated between the ones that handle presets (at the top), and the ones that preview and save the results (at the bottom).
I myself only see benefits here.
Except for the work this will probably take.
but considering Hiccup (please take this with humour) by his own admission didn't even know the search-bar existed until a month ago
That's simply the truth.
And it is one of the reasons I started raising suggestions to improve on the whole interface.
I'm pretty sure I'm not the only one that isn't using all features of the plugin (or even use the plugin at all) because things look confusing and complicated at first (and second) sight.
As for filters... maybe there should be more voices from those (not us) who actually use them? This is a forest-for-the-trees thing to me, yes more options are always a good thing, but the search-bar (which incidentally looks much nicer in its current shortened form) by itself solves many evils.
If we would take my previous mock up (that you and me both like), and tweak it a little bit so to add some of the new current filters, I am guessing 4 filters would be the maximum that can be displayed, considering the available space.
That could look something like this:

But that means that 3 of the 7 existing filters would need to go. I myself don't see 3 that could easily be removed.
edit:
Maybe I do.
I'm not sure I understand why there are both customised presets and user presets.
(but that's probably well-explained somewhere in this thread)
So for me, 'customised presets' as a filter could go, and the remaining filter could show them both?
Also, I don't think I will be using 'constrained by playlist' and ''assigned virtual tag function ids' filters.
And also, such presets will probably already get shown when filtering on 'user presets'?
So together that would indeed make three filters that could be removed. (in my personal opinion)