I assume you mean invaded his house under the sneak and peek warrant, rather than without warning. There is no requirement to give anyone warning. The only change in the situation you describe is the ability for law enforcement to delay the warrant process. But they still have the same burden of proof later to get the warrant and use any information against the accused. All it does is speed up the process, it doesn't change the law about search, seizure or admissability in court.
And no, IMO, we haven't wandered perceptibly, either legally or in reality. The legal changes aren't that significant and, even if they were, one has to assume 'all law enforcement is corrupt and out to control us' in order to have any real concern here. Honestly, all the Patriot Act debaters are colored more by their biases than by the issues that are really in play. Even the people who were pro-Patriot Act and are directly involved in law enforcement will tell you that it hasn't changed that much. The right wing tards who say it's been such a raving success overstate the conviction rate and the left wing tards who say we're being manipulated overstate the impact of the law. Nothing new. The radical extremes in this country do that to just about every important issue in this country. Best to just ignore them, because neither really has any control over the long term direction of this country or our daily lives unless we choose to let them.
EDIT: And clutchslip, the comment you made about the Courts striking down provisions as unconstitutional is another reason why I don't lose any sleep over the Patriot Act. There are mechanisms in place, such as the Courts, to address and cure these ills. Fucking great country we live in, ain't it?