Unfortunately I cannot understand the aversion (or is it just the confusion?) of the Transfer Queue. I'm very interested to know what problems you are exactly having? Could you please tell us what is not working for you or why do you think the Transfer Queue is a good reason not to use SmartFTP anymore?
There was a small bug on Windows XP where the Remote Browser did not automatically update the view after the file has been transferred. It confused a couple of users as they believed that the file has not been transferred at all. This bug has already been fixed in the newest version which is available from: https://www.smartftp.com/download
Other than that I do not think there is something fundamentally wrong with the Transfer Queue. It has been part of SmartFTP for almost 5 years and according to our poll almost 50% of the users voted that they have already been using the Transfer Queue as their favorite transfer method. Also most FTP clients today (FlashFXP, CuteFTP, WS_FTP, FileZilla, etc) use some kind of Transfer Queue or Transfer Manager. So this is not a new concept you are looking at.