Gesture type mark menus are used in Solidworks for view changes and are a great time saver. However, SW works with engineering type views and doesn't have separate viewports like MoI. For instance, in SW, if you select a front view, you can still rotate it away from the front view accidentally. Once you have learnt the mark menu, it is a great time saver, but 1) You have to learn it and 2) This type of accidental view change doesn't happen in MoI.