I absolutely agree that we must be vigilant in our defense of Scripture, that we are to never add to it nor delete portions of it for our own comfort. However, that being said, I must point out some details in Scripture which speak to the situation now as possibly leading up to the events of Revelation.
First, to show what the differences are between the current situation in Israel and the situation in 1949, 1967 and 1973, you must understand that one of the biggest prophecies of all is concerning Jerusalem's rise as the primary focus of the whole world. That Prophecy, found in Zechariah 12, has to date never been fulfilled. I've included it here for reference.
[2] Behold, I will make Jerusalem a cup of trembling unto all the people round about, when they shall be in the siege both against Judah [and] against Jerusalem. [3] And in that day will I make Jerusalem a burdensome stone for all people: all that burden themselves with it shall be cut in pieces, though all the people of the earth be gathered together against it.- Zec 12:2-3 KJV
If you'll notice the portion I highlighted, the very first thing you notice is that the people all around Israel will lay siege to both Israel and Jerusalem. While this has happened in the past, the results of that siege have never happened before. The portion that reads "...all that burden themselves with it shall be cut in pieces," means, literally, that those nations who attempt to besiege Jerusalem will be torn to shreds. The Hebrew word used here, sarat, means to literally lacerate or be torn to pieces.
Furthermore, you'll notice that this siege is not just Israel, but Jerusalem as well. To answer your earlier question about why this situation is different, just ask yourself this.
Who completely controlled Jerusalem during the 1949 War of Independence and the 1967 Six Day War? It wasn't Israel. Israel only captured part of Jerusalem during the 1949 war and only captured the remaining portions at the conclusion of the 1967 war.
Furthermore, while Israel controlled all of Jerusalem during the 1973 Yom Kippur War, Jerusalem was never surrounded and besieged.
So, now that we've established that the events of Zechariah 12 have not taken place and events now are beginning to align to allow it to finally take place, you can see why we are watching these events with growing excitement. While we cannot know the day or hour, we can know from watching and reading carefully that we're very, very close now.
That Jerusalem is presently a 'burdensom stone' at present is beyond reproach; nobody can deny that WWIII can erupt out of Jerusalem over the course of any arbitrary hour from now until whenever.
Every eye in the world casts a very wary glance towards Jerusalem each and every day.