Well I use PhotoShop 7 and would not wish for anything simpler - and I only use a fraction of the features, but they are MY fraction.

It is like a dictionary, or 250,000 words - we all have one and I would bet most people have a lexicon of less than 5000 words unless you are a journalist or poet (etc), and then less than 10,000. So why do we value the dictionary of 250,000? Because my lexicon fails me in different ways to the next guy, and I need to know when I need to know.

PhotShop is like that, and so is Word (for all it's foibles) or DreamWeaver or ......