LOL, no. All using one does is put you ahead of the S3's. However, those S3's that were ahead of you almost always also have S2's, and can change quickly to that. Its not uncommon to see 20+ people standing by for 2 seats, all 20 of which burned an S2 in a war of attrition. Sometimes people even wait til the last minute to list, to see if they want to use an S2 or S3, so they don't even show up on the standby list until almost time to board.

S2's can help in some situations sometimes, but they are nowhere remotely close to positive space.