Microsoft has now relased the SCCM Service Exensions, this means that you can download and install them and get an easy way knowing when an update is available.
The extensions can be downloaded from Microsoft Download Center here http://www.microsoft.com/en-us/download/details.aspx?id=45033
When installed you will get a new node under Administration called Site Servicing. This will give you a quick view of which version is installed and the latest released CU.
This does not require a restart so there no reason not to install this.