If you right click on the scrollbar in your Visual Studio editor, you can click on Scroll Bar Options and customize it. You can enable markers for changes (yellow for unsaved changes, green for recently saved changes), marks, errors and current caret position.

You can also switch to map mode (with Preview) for the vertical scrollbar, and this gives you a preview of the code as you hover over the scrollbar.

Try out the different options and see what suits your workflow best.