I personally don't go through the effort unless the healer is fresh, I'm undergeared, or it's a fight I'm unfamiliar with. There are some bosses and phases where it's helpful (Calofisteri comes to mind, as well as A5S' Hummelfaust), but it's very situational.

The 10% Strength debuff isn't that helpful when such a large percentage of enemy damage is based on Int. It honestly feels like tanks were designed with WoW-style encounters in mind (where the effective 7-8% damage reduction would be extremely helpful), instead of FFXIV (where there just isn't enough damage going out to make it worthwhile). Tank design--outside of WAR--doesn't quite feel like it matches encounter design, and I'm hoping they address this in 4.0, to some extent.