It depends on the jurisdiction. You'd be right for USA, but in many other places click-through agreements (and shrinkwrap agreements for e.g. physically sold software) aren't worth the paper they're (not) written on, they're not considered binding.
Germany for example. The legal argument for it is quite simple. Once a software is sold (in the "buy a license" sense), the manufacturer has no further right to limit your use of the software if they didn't include these terms into the sale contract. Therefore a manufacturer cannot force you to agree to a contract after you've already bought something. That includes click-through agreements if you need to "agree" to them in order to use the software.
The only way to get a EULA to work in Germany would be to include it into the sale contract between the consumer and the vendor at the point of sale.
I think you're confusing software shrinkwrap license terms with click-through agreements. The latter would apply to software as a service and require affirmative consent from the end user/licensee. As far I know online contracts are still enforced under the German Civil Code as long as they're properly formed, just as is the case everywhere else that I know about.
In the US, browsewrap enforcement is debatable, but my conclusion after looking into this question is that properly-formed clickwrap is enforceable in most US jurisdictions that matter.
