The answer is in your question.

Twitter looks the same even after login except some trends and suggestions on ur left hand side.

Also i have to point out that twitter handles are interest related, so if u like football u can follow kaka,ronaldo,etc.

So the tweets which r worth following depends totally on ur interest

It's really easy to look at one person's twitter stream - I've posted mine below.

I can't think of a way to look more generally at what twitter looks like, and I say that it really does take some getting used to. At first, it just looks like a load of nonsense because of the way that people link up and post links etc.

I'd say that the best thing to do is to try signing up and have a play around with it for a few days (I guess you can always delete it if you don't like it after that).