I have several occations been able to save a pt from a full wipe - if the healer went down - due to having physick on my BLM, most often in low-lvl DR, but also in other content, in particular where there have been long breaks between the hard-hitting actions of a mob. So yes: there have been situations were it has been a positive impact for sure - even if you haven't experienced them youself.
And for healers not even tossing a regen for 20 sec when a party-member have low HP: I have died due to ticks of <insert your pref. DoT here> where healer have not paid attention to the other party members due to "no AoE that can't be avoided coming up", and also saved my sorry ass several times by healing myself for those 400 HP (or 800-1200 if having to cast 2-3 physicks) that meant the difference between life and death on that next tick.
So yes: the scaling of physicks is soarly missed.
And to get the numbers right for a BLM, Physicks at ilvl 130 would heal for aprox 7,5 % of total healt = 450hp
What I would wish for, is 7,5 % of current HP (don't have the numbers in front of me as in the office), but say 9k hp, that would mean 675 Physicks, or 10k hp = 750 Physicks.