It's a shame Jobs don't get traits. It would be cool if SMN got a trait that maybe gave a proc on DoTs to make the next summon instant cast and have it do some kind of attack when pulled out, so it would be worth it to swap between Ifrit and Garuda at least. Maybe even have Titan summons with this proc give a damage reduction effect to your party. Something like that. Then summoning would be part of the rotation.