I've walked to the ballpark a zillion times, including when the walk was an hour away, and I have taken the T to the ballpark a zillion times. Nowadays I drive to somewhere in range of the ballpark and then walk, but it gets more problematic every year. I have probably been to thirty opening days but those days are done because it is not worth the trouble of figuring out where to park on a weekday, even if I am thinking of parking out of town and taking the T. Accessibility is an actual thing whether or not people want to get all high-minded about it.