It is wrong to " think that we use present perfect just for finished actions in the past". Finished actions in the past use past tense, not a present perfect. However, your instinct about those two examples is correct. You could use the present perfect continuous in both of these sentences, and the meaning would be the same. There is no difference in meaning between "I have played hockey since I was 5." and "I have been playing hockey since I was 5." or between "She has lived in London since 1994" and "She has been living in London since 1994"

There are sentences*