Small triangles can slow down 2D simulations significantly. Currently, after creating a 2D mesh, I export the 2D mesh to a GIS software to check how many triangles I have below certain size and where they are. This helps me address the problem of small triangles efficiently. it would be helpful to have a similar functionality in ICM (i.e. triangles browser).
There is an article in the Knowledgebase (Support Portal) which details steps on how to find small elements with theming. See "Tips for a Good Meshing Experience".
Richard Body commented
I agree this would be helpful, but one effective solution is to create a theme on element area where you colour the cells below the required; above the threshold the cells are transparent. To highlight the really small cells I also turn on the arrows option. This is one of my default themes that I use whenever I am doing a lot of meshing.