It was easy and fast to find tags before, but now one tag takes up a lot of space and nothing is in order? I can't find anything now. Browsing on mobile one tag takes up the whole screen. How is this useful?

Sorting was changing to show popular tags first. Alphabetical is only useful if you're looking for a certain tag, but all the tags are on the same page, so you can use browser search if you're looking for something specific. In any case, there's now a searchable dropdown on the page which should make it easier to go to a specific tag.