It's easy enough just to find what you want in Dash & then drag it onto the Unity dock so you can find it
Screenshot from 2013-04-29 07:54:43.jpg
In the attached Screenshot I've got all my most used apps Locked to the dock for easy access, & only need the Dash for finding apps that I don't use that much.
Dash has been in Ubuntu since the introduction of Unity, but the first versions listed all your Apps with an All button to expand the list, it's only been introduced in recent versions of Ubuntu the new way of searching for Apps and only show the most recent apps by default. Mac OSX uses a similar thing but you don't have Dash but have an Apps folder in Finder with all your Apps in.
If you type Games in the Search field it will list all your Installed games along with a suggestion of games that you can Install.
Toshiba Satellite Running Ubuntu Development Release