If you use a lot of plugins, chances are you're adding new ones to your tracks quite a lot. You can do this with the keyboard by pressing B or the Insert key with a track selected - it also selects the search bar in the browser automatically, so you can quickly search for the plugin you want, press Down Arrow to select it (or a few times if it isn't the top result), then Enter.
Note that if you have a device on the track selected, it will replace that instead. Maybe this is what you want, but if not, press T first to select the track, which has the side effect of deselecting any selected device too.