I'm certainly not suggesting having more than one location for tasks. In fact, the opposite.
Let's take your example. You share a link from Evernote to Things with the note title as a task. First, how are you "Sharing"? Is that copy & paste or are you using an intermediary? Second, does the note title describe all the things you want to track progress of (e.g. One item), because you would have only one Things task. If so, the solution you indicated would work fine.
What is more typical is the note is at the level of a project with many tasks and context within the project. You either write those individual tasks within Evernote and have them sent over to Things as individual tasks, or you go through the process of typing those individual tasks into things so you can manage them as discrete tasks instead of an entire project. What TaskClone does is save you from writing the individual tasks twice. It copies them from Evernote to Things. It is not a place to manage tasks, just a conduit between two services.
It can serve as that conduit at the note level, so you can get the note title into Things as a task or as a conduit to get individual tasks into Things. Either way, it's saving retyping or copy/pasting.
Only you can decide if that helps your productivity.