just looking at a per-say 24min WSG game. HU will still get up to 8 EFMH uses instead of possible 12 before. now compare that to other classes who may get only 4, HU have a racial twice as good as any other class, don't have to PVP for a trinket, can use other worthwhile trinkets.
i have 2 HU 70's, even at 3 min, i will still not equip a 2 min PVP trinket. i can't really see any higher levels doing to either other than BGs that take a very long time. in arenas which are extremely short, HU still will want more power gained from worthwhile trinkets. 3 min CD is good for arenas, maybe bad for the new rated BGs?
imo, i really still think EFMH is unfair, especially to players who didn't BG and just quested. when real world PVP occured, generally HU's EFMH is a savior and I WIN racial, facing races who didn't bother to PVP maybe at 10-19 to at least get a PVP trinket.
3 years ago that was the best thing i ever did when i leveled a gnome, was PVPing her at 10-19 just for the PVP trinket, really saved me alot in real world ganking/PVP. even at that time, hardly any players did that.