[e2e4]

From Bosnia I see the matter different. My knowledge is poor but my way is to say my opinion.

[/quote] riverkid
1. Tell me some of the fun things you did (have done) since you came to camp. for me did is wrong here. sorry. with since you came you have pointed to the exact past! From that exact time and to now you have done something.

2. I lived (have lived) in Toronto ever (no need for the word ever if have lived is used) since I came to Canada.

3. It's like, it's like fourteen years since the favorite won the National. won is correct here because the past has been stated clearly, definite. fourteen years! They won before the fourteen years! how to use present perfect then?

4. Is it six weeks since we saw the last one then? saw is correct here because you have pointed to the past when it happened! The time is definite, six weeks, exactly! I wonder is it six weeks after I saw it.

5. Since Billy's come (came) around (round) that's all we've been talking about. (you've used continuous form for you decided to say how you have been taking your time)
around is American English and round is British English.

Numbers 1 to 4 are perfectly grammatical and really quite common in speech. {the last three, in SeaGreen, are examples from the LGSWE}
As I already said it could be the United States English.

There are of course, times when the speaker feels a greater need to use the present perfect, witness above, the three examples in SeaGreen from the LGSWE.

In number 5, the speaker chooses/chose the present perfect. In numbers 3 and 4, the speakers could have chosen to use the present perfect but didn't.
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The present perfect aspect is very simple to make but it is very hard for many people (me too) to use it properly.