I'd say a golden age is probably the best use for the scientist. As you mentioned an Academy isn't so good and we don't want to bulb Philo if we're taking the war-path.
When you're slowbuilding units for an invasion is actually a pretty good time for a GA. You can get a temporary hammer advantage, turn it into a temporary army advantage and then attack before your opponent has a chance to fix that.
The only problem is, we would probably like to use the GA to revolt into some better civics too. So maybe we should delay it a bit if the extra bit of research would let us reach those civics by the end of the GA.
When you're slowbuilding units for an invasion is actually a pretty good time for a GA. You can get a temporary hammer advantage, turn it into a temporary army advantage and then attack before your opponent has a chance to fix that.
The only problem is, we would probably like to use the GA to revolt into some better civics too. So maybe we should delay it a bit if the extra bit of research would let us reach those civics by the end of the GA.