You can choose which taxonomies should have the filter from the plugin settings.
in this filter means bunch of words separated by E.g my+example+is..
Go to WP-Admin -> Settings -> Tax admin filter and enable the filter for existing taxonomy in the plugin settings E.g.
Post Categories by checking the box near the Taxonomy name..
Upload the folder and its contents into the wp-content plugins directory of your WordPress installation.
Yes, it's the same as dealing with the native post...
Well, it provides faster filtering and also bulk selection, and the speed improvement of page loading time when using Select2 is also major contributing factor...
It kind of depends on the amount of terms, the number of levels, the performance of your PC and the browser you are using.
As example without this plugin ~7000 terms in my taxonomy killed my IE browser and I had to reboot, and my PC is brand new, so in this case, Select2 option saved me.
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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