To be fair, it really is a bad time for very high population servers. Not only do they have a queue to log in, but they have a queue to get to the Gold Saucer, which is otherwise instant for most other servers. It'd be like a booked major hotel only having one operating elevator, but instead of adding more or allowing access to the staircase to help alleviate some problems first, they decide to throw out major promotional discounts or free stays to draw in more people and add to the existing problem lol. Bit extreme, but covers the general idea lol.
Otherwise, for the other servers, it's not a big deal at all. Leviathan isn't as bad as ones like Balmung, so I'm glad we generally don't deal with log in and access to Gold Saucer queues (yet).
Something you need to keep in mind about this is that when it comes to MMORPGs, the current method is that you don't necessarily rely exclusively on veteran players. As in, that's not your progressive financial source. It's definitely a part of it, but you'll know early on if the game will keep such veteran fans or not, hence the progressive part. Most players today are fickle with their dedication to just one game. Some may stay for days, others weeks, months or maybe even a year (or more). Those that leave may come back. They, once again, may not stay for longer than the mentioned days/weeks/months/years. They are the progressive income sources, since time dictates new and old players coming and going.
Mind you, this is not saying they look at forsaking the veteran players, as we all know that's NOT the case. But rather it's about the 2-way door that gaming is these days. We're not going to spend months playing every game we buy. We're not limited to just one or two good games like we were in the past. Thus, marketing and how business is conducted must change to cater to that lifestyle.