Is Martha’s Vineyard worth the effort?

We did Cape Cod and Nantucket. MV seemed like a PITA.

When are you looking at going? Getting to watch a Cape League game was a nice little bucket list item for me.

We did two nights there as part of a New York/Boston trip a few years back. I thought it was worth it, but wouldn't plan it as the one feature of a vacation.

-- Flew up to and spent a few days in New York
-- Picked up a one-way rental car the day we left New York, drove to Woods Hole, MA and took the ferry to Vineyard Haven; got to our hotel in Oak Bluffs just after check-in time.
-- Spent the afternoon and night there, had dinner in Edgartown .
-- Drove all over the island the next day; went to Chappaquiddick, Aquinnah Cliffs Overlook, South Beach, and jumped off the "Jaws Bridge" (it's a thing). Had dinner in Oak Bluffs.
-- left the next morning on the ferry back to the mainland, went to Cape Cod as far as Nausat Lighthouse, then up to Boston for several days, flew home.

Water on the beaches up there is COLD. Jaws bridge was not as bad as it is an outlet for a tidal pond.

Yea I’m thinking a few days would be more than enough there? Then move on down the road to Bean Town.

Happy to give you some things to consider. I'm originally from Boston and my folks lived on the Cape for their last 30 or so years so I've been out that way plenty.
Lot of variables, like when are you going, how long, what else are you doing on the trip, etc. All of that can impact where you might want to go and for how long.
Happy to take discussion offline if you want to leave me an email address.