Bored of GBs? Let's take a brief review to the alternatives:
Op_c..onvoy => Many people would like to see that mode fixed, even if is a just-for-fun game mode with no exp. Bugged mode (guns sometimes get glitched and ship doesn't shoot), no proper balance of any kind (it doesn't have an autosplitter) and it never was and it never will be fixed when it has a lot of potential. It just server for making some AB records on that book of the records.
GB2=> Abandoned (the way to "abandon" a game mode is giving it less exp than GB) because of the posibility of the crashing of the flagships because if the flagship crashes everyone notices it. Another game with somekind of teamwork abandoned.
Occupation mode => I preffer to not comment on this one. It's awesome how SDE brings tons of useless stuff to the game and don't fix it. What is the point of having a dev team developing game modes noone will play? Another game mode with a good idea of teamwork on it failed.
Fleet War mode => A game mode with a lot of potential, failed due to bugs (host and subhost system didn't work well), limits of the room, somekind of fair balance (tier based or something similar) and the lack of decent exp. Again i repeat, another game with a good idea of teamwork on it failed.
Skirmish=> Similar exp to blitz, but limits were bad designed, it was reported but they did nothing for fixing it. Another useless game mode.
Night Battle=> Completly out of date, SSs not allowed and the same BB limits GBs had like 5 years ago. Another dead game mode.
Select mode => Few exp, people doesn't play.
Blitzs => You get more exp leeching in a GB than actually playing in blitz, only really new players need to play blitzs (you gain more exp/credits there than in GB), but we don't have new players.
WaWs=> The most retarded game mode ever created. Yes, lot of exp, but completly arcade, f for fictory and completly egoistical game mode. BBs rushing at their own dying as fast as possible, CVs bombing at their and SSs, well, SSs were forbidden there precisely for the lack of teamplay, brilliant solution instead taking a deep look into it and fix the real problem.
That's why people play GBs.