Welcome to EYB HunyBadger and thank you for the feedback. We are currently working on a complete redesign of the UI and search functions - we did usability testing last week with several current EYB members and new users and I think you will be pleased with the changes. Of course, it then takes weeks to do the actual recoding but it should be complete by the end of June.
The way that cookbooks are added to your Bookshelf will be vastly improved, also the way in which you search for them. If you are searching for a book title that is used for more than one book, like The Essential Vegetarian then search on that and you will then see the list of results, with author names and book covers and you can then just select the one you want to add. Adding author names to the dropdown list wouldn't really be any quicker, and would be a lot more text for you to scan on other searches.
In the next two weeks we will be expanding the EYB Library to over 100,000 cookbooks so you should then be able to find any book you own, including Greene on Greens. If there are any books you own that are not listed (hopefully not many as we will list more than 140,000 unique ISBNs) then you will be able to request that we add them to the Library (and your Bookshelf).
Any other thoughts you have, please post them. Feedback is very welcome.