Yes, indeed, by all means I take a chair.  Mine is a GCI Quik-E-Seat, a 3-legged folding chair with a backrest.
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It weighs about 5 lbs and is worth every ounce.  I've used a small tripod chair, a Crazy Creek, and an Alite Monarch, but none of them is as comfortable or just plain useful as the GCI.

I lash the chair into the stern of my solo canoe with my two paddles secured in the bow when portaging.  The portage yoke is set to balance this extra 8 lbs just a tad bow-light.