traffic views performance

I would like to know if you guys using Views for high traffic web sites or not?

There are a lot of mess in our current websites.. Some of the pages and blocks were built using views and some of them using about 6000 queries to display nodes listing on the page! And some using custom modules and custom queries. I personally prefer to write custom code because it easier to maintain and it's easier to find where is that query if u need to modify it.