Yes. A plunge base is useful for almost all freehand use.
One jig that every router user should have is for routing exact size dados or grooves. They are the same, but grooves are stopped--which is best done with a plunge router.
You set the width by placing the material you want to fit into the dado in the jig, locking it down, then using a straight bit with a bottom mounted bearing and then cutting the dado/groove in multiple passes until it's the depth you want gives a groove the exact width as the thickness . The stops on the plunge base make that very easy to set and to do.
Getting the top piece with screws, to be 90 to the side pieces increases the utility.
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