This is very true. With any project, when you are so closely involved with the workings of it you can easily miss bugs and small things that other may notice straight away.

I often find this happening myself with anything I work on. Classicamiga is a good example, where I may spend ages working on the site, getting something to work correctly and don't notice something obvious that other members instantly let me know about. Things like broken links, strange layout issues, spelling mistakes, something in the wrong place etc. It is so easy to miss something very obvious when you have been concentrating on getting a specific thing working correctly or looking right.