It would be great to have a list of the used fonts in a file, at the top of the font list. This would make it easy to select and see the fonts that are used in the file. This would be great across all the Adobe products.
You can check my script: http://bereza.cz/ps/ "advanced font remapping" If you use Select > All layers and run script, it shows you all fonts, how many times they are in document and if single layer has multiple fonts and you can remap fonts for whole document. Or fix missing fonts.