Ctrl-t in vim only navigates, going back to the last position that a jump was initiated from. In QtCreator many more steps are taken in the meantime. For instance folds can be closed when hitting ctrl-t. Also simple navigation using the arrow keys or during insert mode are traced back which is not something that happens in vim.

I very much prefer the way that it works in vim as I sometimes end up hitting ctrl-t 100 times where it would only be once in vim.

The ctrl-t feature in vim can be visualized with the command ":tags", there typically is nothing being pushed onto the tagstack when you do normal insert/edit.