Problem is that all the effects are shown under the Tags they are assigned, which kinda speaks against alphabetizing being an easy fix.
Personally, I find things quite easily by clicking the Search button (big ? up top) and simply typing.
Clicking Search and typing "Painterly" or "Georgia" will find all name-related presets and restrict the list, no matter where they might be located in the larger Tagging scheme. Works quite nicely (for me at least).