I'm in one and it's no trouble what-so-ever. You set the lineup once a week and that's it.
I haven't played fantasy football in some time. So, perhaps I don't remember correctly. But...but...but....it seems fantasy football is tied much more with the draft and trades than with the upkeep of a team.
In football, there are fewer positions if i recall: QB, WRx2,RBx2, TE, UTIL (WR/TE/RB), kicker, defense. That's 9 players. Then there's a bench of what, another 7 or so players? Comparatively, baseball has 16ish starters and 20 some odd total positions.
Football sees a few breakout stars every year, but they're usually already on a roster. Baseball constantly has breakout stars that are called up int he middle of a season that aren't on a roster after the draft. The scrapheap is much larger and tougher to sift through.
Football has one game a week which makes the matchup much more easily recognizable. In baseball, it's more about who is hot/not. Who is healthier. There's two completely separate things to look at pitching/offense.
In short, baseballs season is twice as long, has twice as many players, has seemingly twice as much turnover and an introduction of infinitely more players.
A good draft can make a fantasy football year, whereas a good draft combined with good transactions is needed for fantasy baseball and those transactions take a lot of time to research.
You're not wrong.....But the part about baseball being about who is hot/not and who is healthier, etc is a problem in REAL baseball, too. Heck, we struggle with it in the game threads. Slumps don't really exist quite the same way in football. Injuries do though.
Another thing is that baseball has really gone in a geeky direction with sabermetrics and this stuff. And it's more OK today than probably at any other time to be a geek. But geeks are only cool within their niche, with other fans that already have at least a basic understanding and appreciation. In other words, I don't think anyone with zero baseball knowledge would become a baseball fan after reading Fangraphs. And Fantasy Baseball is kind of geeky like that, too. Fantasy football is more accessible to casual fans since the complexity level is lower, as you point out.
Or maybe look at it this way: by managing a fantasy team, you are kind of aspiring/pretending to be the GM of a team, right? Well, in real baseball the trend is to hire guys with advanced degrees in Economics (or similar) from prestigious colleges to be GM. Geeks!!!!!!!!! Guys like Mozeliak, Luhnow, Zaidi, etc. In football, you have guys like John Elway and Jerry Jones as GM. Which set of GMs would you rather sit down and have a beer with?