You're not alone in disliking them... That was one of the (many) things that swayed my dad to the EOS 1 instead of the Nikon F4.
As for me... It depends. I've not had one for years, and I don't like the ones offered for the digital bodies.
The first vertical grip I had was the VG-10 for the EOS 5. This was a slimline, lightweight vertical grip that added no other functionality (ie it did not double as a battery pack, despite the battery-hungry nature of that camera). I liked that grip a great deal and it was permanently attached to the camera.
I replaced that with an EOS 3, and mostly did not use a grip - in fact, I never owned one, but I did borrow my Dad's PB-E2 now and then. On one trip to the seychelles I shot the whole trip with the PB-E2 fitted (and that was the last outing of my EOS 3). The PB-E2 felt amazingly solid, since the standard plastic grip/battery cover was removed, and replaced with the cast-metal grip in landscape orientation as well as portrait orientation (making it more structurally integral to the camera than the digital grips which just bolt to the bottom). However, it was big, bulky and HEAVY.
In my opinion the main problem with the grips offered for digital is that they are huge , through trying to fit two BP-511s or LP-E6 in the orientation that they do, with the tripod mounting hardware above and tripod socket below. There's no option for those of us who would like a smaller grip (VG-10 sized) without any increase in battery capacity (since I just don't need it). I am considering trying to create FrankenGrip, by buying a VG-10 and a cheap BG-E4 copy, using the BG-E4 top-plate and data connector and somehow marry it up to the VG10 body, and shoehorn a 7.4V Li-Ion cell and battery circuit board into it.
Quick recap, then, is I like grips that are slim, low-profile and light. I don't like what canon offer.