Why should we worship God?

A question that people who aren't Christian often ask is why should we worship God? What right does God have to legitimately want worship from us? Isn't God a megalomaniac for making heaven involve praising Him?

There's an analogy I've started to use a lot to explain why I would want to worship God that borrows from everyday life.

Let's say you have a friend who is an amazingly good person. They are 100% genuine, kind, respectful, trustworthy, dependable, etc. They are generous to a fault, and are a very kind husband/wife who works very hard to support their family. They sacrifice a lot to help others, even people who aren't their friends or relatives.

Now, you would, I suppose, respect them a lot, and this would just be a natural reaction to the truth of the situation.

Now, what if God is perfectly loving (and not just perfectly good but also can't be tempted otherwise), infinite in abilities and knowledge, and is the creator of everything? Then respecting God and putting God at the centre of one's life is not anything different from one's presumed reaction to that friend - it would just be a natural reaction to the truth.

And we say, as Christians, that God really is all those good things, and so worshipping God is a natural reaction to the truth of the situation like respecting that friend is a reaction to the truth.