I don't find buttons from issue #6411 usable at all in day-to-day development. I believe they are intended to help, but I don't find them usable at all.
Simple example: How can I see all open issues assigned for me for for 1.0 milestone? This is very obvious search you do at the beginning of your working day, but there is no way for that with one click.
Previously the issue tracker uses buttons for the filters instead of the current state. Issue #6411 is requesting a custom filter, which would likely be equivalent to saving your advanced search query.
With the resolution for issue #6411, you could save your query as a filter. After going to the issue tracker, you would click once on the filter, and then only open issues assigned to you for a specific milestone would be shown.