I'm kinda in the same boat. We're at 7.4.1 and the IE8 thing is bugging a couple of poor souls, but that's the only compelling reason we've got to upgrade.
Basically, I've decided that if I get bored at some point during the night (USA time) and have 20 minutes to kill, I'll upgrade. Otherwise, 7.4.1 is fine for now. I've upgraded my test box at least 5 times now, so I'm pretty comfy with the 7.5.x upgrade.
I thought I'd have time during a 2 week trip abroad in August, but I was dealing with sooo many issues (I've moved apache twice and mysql 3 times since June) that 7.5.3 sort of fell by the wayside on that trip. We'll see if it happens on next week's trip.
