We used to do the Hotel Park, Sleep & Fly thing but for the last five or so years have just driven up the day of the flight....usually in the wee hours of the AM when there is zero traffic for the one hour drive. Driving to BOS in Friday rush hour traffic was just not worth it. The shuttle to/from the hotel ran every half hour instead of every 10 minutes or less for the parking lot, and the hotel stay was significantly more expensive.
There IS a value in doing whatever you feel more comfortable with so go with your gut....
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