Doesn't Excel 2007 have an option to quickly zoom to the full page, the
width, or the height?

Most current programs provide quick menu options or toolbar buttons for
viewing a page, or in this case a worksheet, in one screen or at full width
or full height. Even Word 2007 provides these options.

I recognize that there may be issues with the fact a worksheet can span
multiple pages, but this issue could be easily resolved. Simply allow the
user to toggle an option that would instruct Excel, for purposes of the
screen display, to base the zoom options on pages as printed or on the
worksheet as a single page.