It's clear that it's not literal when you take the rest of scripture into account, so it doesn't have to be explicit in the Revelation 20 text itself.
Scripture teaches that Christ reigns now (Matt 28:18, Eph 2:19-22, Rev 1:5), that we are priests now (Rev 1:5-6, 1 Peter 2:9), that Satan is bound now (Heb 2:14-15, 1 John 3:8, Acts 26:18, etc.), and that all people will be resurrected on the same day (John 5:28-29, Daniel 12:1-2, Acts 24:15) and all people will be judged at the same time (Matt 13:36-43, Matt 13:47-50, Matt 25:31-46, Acts 17:31, etc.). And it teaches that all believers will be changed to have immortal bodies on the day Christ returns at the last trumpet (1 Cor 15:50-54) while all unbelievers will be killed on that day (Matt 24:35-39, 2 Thess 1:7-10, 2 Peter 3:10-12, Rev 19:11-21). So, when you take all of this into account when interpreting Revelation 20, there's nothing to be nervous about when discerning that the thousand years are not referring to a time period on earth after the return of Christ.
You have to understand how Premils take it. I understand all of your points, and we may never be able to agree. But it takes 2nd place to just getting along as Christians. WPM recently became exemplary in this regard, a true Christian in my book. Not that I'm his judge anyway--he stands or falls before the Lord. And I believe the Lord is pleased when His people get along.
So not to be cantankerous, let me just let you see how Premils might see all of these facts.
1) We both agree that Christ is ruler now, but not that his reign on earth has begun.
2) We both agree that we are priests now, but we have not yet begun to reign on earth with Christ.
3) We both agree that Satan was in a sense "bound" for the moment that Christ forgave our sins. The story of the "strong man" was just a principle by which Christ proved that God is stronger than Satan. Satan was not powerful enough to stop our redemption, and could no longer accuse us. But he continues to be free to be prince of this world, and rage against God's People, the Church.
4) We agree that at some point all who have not yet been judged will be sentenced together. We believe that will be at the end of the Millennium. But people are judged in different incidents throughout history, and there will be a special judgment when Christ comes back to defeat Satan and Antichrist.
5) We both agree that all Christians at the end of the age will be resurrected and rewarded. But we do not agree that mortal human history will continue after that event, making another resurrection and another judgment necessary.
6) We both agree that all of Antichrist's army will be defeated, and his rebellion completely quashed at Christ's 2nd Coming. But we do not agree that all of mortal humanity will die at that point in time.
You see, we all believe in Scriptures. We just see them differently, perhaps due to a lack of information or detail. Depending on whether you see the Millennium as literal or symbolic, you will see these things differently.
I agree that Rev 20 need not explicitly explain that the Millennium is symbolic if it is obviously so from how it is framed, perhaps in reference to other former Scriptures. But I don't see anything that makes this necessarily symbolic except that the number appears to be "rounded off." On the other hand, since God is in charge, He can work with exact units of time. You have to decide. It really isn't worth fighting over.
I certainly don't mind if you or WPM or anybody else wishes to emotionally appeal to your chosen position. I just want to remain on good terms with you all.