Something that personally annoys me in Workbench is that it requires .info file to display an icon and determine which program to use to open a target file. I always found the Windows way of doing more natural; that is that file extensions are used to determine the type of file.
However I am really intrested to know what others thing about it and if anyone favours the use of .info files over the use of file extentions.
I think it is exactly the opposite. The .info files are actually a very useful addition to AmigaOS I would miss. They are like Windows .ico files (which maybe you haven't seen because they are hidden), but instead of just containing graphics info for the icon, they also contain information about which tool should start the application, tooltypes information, etc.
I really like .info files!
And...like others have said, files without icons can be started by their extension (.jpeg, .tiff, .aiff, etc.) if you set up DefIcons in AmigaOS properly. It will even give those files a general icon related to that filetype.