I too am very disappointed with this add-in. I have created my list in MOSS, and wanted to export to Excel for quick data entry. Having to then publish my list as a NEW list, which loses all the column types i.e. Date columns become text, dropdown choice become text, etc.. makes this add-in worthless.
I can understand that Access for data entry is a better fit, but as already pointed out, not everyone has Access installed, therefore by removing this functionality from Excel 2007 Microsoft is using it's position to force users to purchase Access if it is not part of their Office suite.
This worked perfectly in Excel 2003!