When you are working in the Timeline Manager, you can press H to center the Keys, F-Curves and Motion Systems of a selected object or property. If you only want to see the position f-curves of an object, then select the position and press H and it will instantly show you the highest and lowest value (top to bottom) and the first and last keyframe (left to right). This is an enormous time saver and avoids the wasteful zooming in and out and panning around searching for the keyframe and curve you are fine tuning. Open a new project add an object and set a few keyframes and practice using this shortcut. You will love it and never go without it again when animating. Enjoy!