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It means to change places with someone. Here's a similar expression: If I were in your shoes, I would find another teacher. Haha, I'm not suggesting you need to do this, but you hopefully can see the meaning here.

They have colds, because there is more than one cold.

I can't clearly identify who you are, but I'm 99% sure you're not the person I remember, so the answer would be "no". So this will be my correction, hopefully not changing your original meaning.

They are very similar and there's no big difference. If you use the word "sense", it can refer more to the feeling that you have some external stimuli. For example, you sense that there are more and more people coming to see you perform. Based on your perception, you saw more people than the last time. But if you "feel" something, it may relate a little bit more to emotions. Maybe you feel like you have more of an emotional connection with the people you perform for. But really both of these terms can be used interchangeably and there is very little difference.

If you say "why we love it", it doesn't sound like a question. So for example, someone might say: "Why we love it is because it's a really fun game to play'. So the word "do" is needed here if you want to make it a question. The same would apply to: "Why do we use it?"