Want Old Style Filter Menu in Photoshop CC?
As you have realized many filters are moved to Filter Gallery and you can access them from Filter > Filter Gallery. If you are nostalgic or want to have filter groups and filter names listed in Filter menu to keep old habits or you just find easier to work with filters in old style way, there is option provided for you in Preferences dialog. Many of you will never guess that option to Show all Filter Gallery groups and names is actually in Plug-ins tab or section.
So to change Filter menu to old style go to Edit > Preferences > Plug-ins and check Show all Filter Gallery groups and names option. There is info about restarting to see changes what is not valid, at least from my experience, changes will take effect without restarting application. Same tip is valid and for Photoshop CS6 users with difference that same option is listed under Edit > Prefereneces > Plug-ins > Filters instead of Filters and Extension Panels.