Best way i can describe it, is that it seems like everything is less three dimensional.
Ironically, with all my experience on the subject of HID's, i've never actually driven a vehicle with them, long term. Mostly just test drives, and thats usually late evening at the darkest.
I have my conversion sitting at my parents house (Full conversion, with projectors DESIGNED around hid bulbs, rather then just a cheap retrofit) but I need to get new bulbs for them, as the pre-install testing managed to blow both bulbs when a wire was crossed in the stupid ebay harness.
The loss of depth has mostly to do with the fact that halogen bulbs have a wide color spectrum (ie they're throwing out alot of different colors of light all mixed together) and hid bulbs have a very narrow color spectrum.
Best thing to do, honestly, is to add some additional color to the spectrum.
If your 08 has fog lights, which i'm sure it does, try turning them on with your low beams, and see if that changes anything. If not, you can take one of two more drastic options
1. Replace your fog bulbs with something with a lower color temprature to create a high contrast between the two beams. Get QUALITY amber bulbs (no japan imports, no PIAA, no auto store cheapies) like hella dichrotic bulbs, and see how that works.
2. Get a good set of quality amber fog or driving lights. Again, quality matters.
The one solution that works really really well, and i've done this on two vehicles with HID already, is a pair of Hella Micro DE lights (these are very small, projector lights) in the long range pattern, and drop a set of Hella amber diacrotic bulbs in there. That'll give you a very long range (probably longer then your low beams anyway) beam, with little to no glare to other motorists (therefore allowing you to leave them on full time) that contrasts fully with the color of the HID bulbs.
Installing HID's in stock housings is bad. Here is why.
"When you see someone who needs help, help them. When you see someone who needs a hug, hug them... Help those who can't help themselves." -Sgt Andrew Tingwall, NMSP. End of watch 6-10-2009