[JSF 2] Newbie, I'm always using ${} and never #{}. When will I be tricked?

Well,
It because I am a newbie with JSF. If I am understanding well the way ${...} EL expressions works, this is not the case for #{...} ones.
Therefore everywhere I use an expression, I surround it with ${ }.
I only change this for action methods and <h:input ...> target properties.
With no trouble until now.
Because in my mind: ${...} means: field used for HTML output only.
and #{...} field used for HTML output and input.
With this basic vision, when will I be tricked ?
Regards,
Grunt.

Personally I always use #{}. IIRC, the difference only matters if you use JSP. I am in the habit of using Facelets.

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