Ah yes, I forgot about those cases...
The fact is, though, that many who want proof of "abuses" will be the same that will ultimately support such usages as being side benefits of the Patriot Act when that becomes the official line.
Really sad stuff...
Like I said, "abuse" is indefinite. The examples noted were thought to be excessive by those involved, but the investigators thought the action was appropriate. Was there abuse? Not according to the officials. Was WACO an abuse? Not according to the law, some of the Davidians remain incarcerated.
Most of the sunsetting provisions of the Patriot Act have parallel statutes or legal support that does not sunset. The "gap" that would exist on sunset isn't all that big.