I believe that I am not the only one that have encountered this issue - open large solution and while Visual Studio is loading/parsing files/updating intelisense try to scroll to file I need. The result - most of the times I end up with folders or files that are accidentally dragged. And most of the time there is no visual representation of this drag operation.
No more! After I have found VS commands. They add many enhancements my favorite is "Prevent accidental Drag & Drop". Hope you like it too.