I too am sorry to see you go as well, I understand how daunting it appears when you load a gedcom file with over 1,000 names and you see a lot of Suggested Matches. Especially if the names in your file are considered common. I have Johnson, Williams, Smith, Yoho in my family and I tell you, it's not easy. OK, Yoho isn't a common name, but I just like spelling it.
Why are so many of the Suggested Matches not even close in your view, as well as mine. Because many names already entered into WikiTree may not have been as well researched as yours. You may find a duplicate with erroneous data that needs to be addressed is one reason. Also, many names entered have very little statistical data which is really needed to perform a more exacting search. And lastly, the search uses SOUNDEX, a phonetic coding system intended to suppress spelling variations, used especially to encode surnames for the linkage of medical and other records.
Think of it this way, if I had access to your historical files, would you want me to start adding names without making sure I verified them first.
When using the GEDCOMpare, WikiTree is not asking you to completely redo the research you have already performed. It's just asking you if someone has already entered the name you wish to add. Having one profile per person is a fundamental part of WikiTree's Single Global Family Tree mission.
Christine had a good suggestion that if you could start with a smaller file size, it is much easier to use the GEDCOMpare and quicker. Especially with common names, trust me on that one. LOL I am not sure what program you used to create your gedcom file, but could it possibly have a means of breaking it done by a single branch or range.
WikiTree only grows as a viable genealogy site through the addition of well researched data such as yours. I hope you reconsider.