Yeah me too.
If I were Plankton, I would make my computer thingy run around attacking people and I would give Karen some gigantic missals, threaten Mr. Krabs with them, and force him to give me the Krabby Patty secret formula. 
But also, the writers gave Karen a bigger role in the newer episodes, and they wanted her to be seen more. So they made her run around on wheels instead of being glued to the wall.