This isn't as easy as Word's GoTo window, but it is quicker than manually scrolling from left to right:
Right-click on any of the arrows to the left of the tabs, the select More Sheets, a window appears that will show a scroll bar allowing you to find the sheet you are looking for. (Tip: From this window you can double-click a sheet name; this prevents you from clicking it then moving the mouse to the OK button to click again.)