NicPeanut: Congrats to both you and your boyfriend for a well-earned summit! I was hearing this past Friday about how cold it was during the week, and I almost borrowed a heavier sleeping bag for my trip, but it had warmed considerably by Saturday night.
I ran into a lot of people in both directions of the trail who also did not have a great idea about where they were going (following the trail a bit blindly, you could say), or what they were in for (how steep some sections of the trail are). It was actually something my friend Doug and I talked about on our descent.
Now, I'm horrendously anal-retentive when it comes to studying up on a hike/backpack, but mainly because of two reasons: 1) I'm incredibly geeky that way and I love technical information; and 2) I've done most of my hiking/car camping alone so I need to be as prepared as possible to be safe. I don't expect others to be as thoroughly oriented information-wise as I am, but to put Greg's statement another way: it's best to do some background work before embarking on any sort of trip into the backcountry. And in answer to Greg's question: Lots of people do no reading or research whatsoever before heading out. Which is why if I meet someone with a question, I am happy to give them as much info as possible!
There are a lot of books on Whitney and backpacking available out there, and this board, as you've probably noticed, is a wealth of information on the latest trail-beta and equipment/training/other recommendations. One of the best things that helped me with prep is watching the videos from HikeAlongPete, which you can reference through the search engine on this board.
Although you suffered through one miserable night, you still were able to accomplish your goal! Congratulations! I hope the trip was memorable for both your summit, as well as the lessons you learned along the way!
-Laura

PS: For the record, it's TOUGH sometimes to pick Whitney out of the lineup from Trail Crest!