I'm an old developer, but I talk about the latest and greatest technologies three times a week on my podcast, .NET Rocks! I also speak at software development conferences around the world. Needless to say, my brain is focused on the new and shiny. However, I have lived through the same history of .NET that you have.
More and more, I'm realizing that my experience of having come through this history is a valuable thing to those developers struggling with maintaining an early .NET code base and/or those trying to move a code base forward with a new set of technologies.
If I am describing your situation, I'm not surprised. There are several factors that are NOT helping you in your day-to-day activities.
Information on the web tends to favor the most popular languages and tools. If you're looking for a sample of how to do reflection in .NET 2.0, for example, it will take you time to wade through all of the more recent content.
This theme extends to places like StackOverflow and Pluralsight where content for older technologies tends to go away after a while - or at least can be very hard to find.
Another way this built-in bias for the new and shiny manifests itself is in the conference circuit. You won't be able to find people speaking about older technologies because of the limited audience.
If you are lucky enough to find people who remember the "old stuff" there's a good chance that they will either have an attitude about your clinging to the past, or worse, they are constantly trying to get you to rewrite it from scratch.
Let's face it, it's very hard to care and feed for ancient code unless you can find those special people who carry the knowledge and won't berate you or constantly try to sell you something.
That's why I'm writing this post. I'm that guy. Talk to me. firstname.lastname@example.org