1) So basically no oversight at all until someone sues? I'm sure that will go well.
2) No. I'm saying that "more surveillance" does not imply "more effective". It's true that intelligence gathering is useful. It's not true that arbitrarily spying on everyone is useful.
If you do 10 targeted wiretaps and get 5 actionable leads, that's useful. If you do 10000 arbitrary wiretaps and get 5 actionable leads, it's a pointless loss of privacy and an abuse of power.
3) I wish you would show me real dangers of limited right to travel....
Putting that aside, I'm not sure why you're so dismissive of illegal abuses. That's kind of like saying you don't understand gun laws, because the only problems are with people doing something illegal. You might disagree with gun laws, but if that's the only reason why, then your opinion is rather shallow.
Abuses are a significant issue. You should be worried about abuses happening, and you should be worried about them going unpunished. We see this stuff all the time already. It's borderline delusional to think this doesn't or won't happen with wiretaps.
Beyond that, privacy is in many ways protected for the same reasons as speech. If you can speak against a government, you can fight it (at least in theory). Likewise, private communication can be necessary to effectively fight the government. Want to stage a surprise protest? You'll probably be more effective if you aren't being listened to by the police. Or if speaking publicly is dangerous (because the government is restricting speech or because fellow citizens find your views unpalatable) privacy will allow you to speak at least to a select audience.
For one more reason, when you have the NSA mining everyone's communications for keywords, do you think there are no false alarms? Do you think that wiretaps always result in only "bad guys" getting caught? There are always going to be false positives. If 1% of wiretaps result in false positives (I'd wager the number is quite a bit higher), how many people get unjustly arrested, detained, or otherwise hassled? If only 10 people get wiretapped, possibly none. If 10000 people get wiretapped, then 100 will be unjustly interrogated.
Honestly, if you can't think of any reasons why privacy is important, then you're not trying very hard. You could probably plug "why is privacy important" into any search engine and get a lot more reasons than the ones I listed.