Okay. You're in a mid-level party (four 7th-level PCs, say one melee Paladin of Devotion, a Sharpshooter fighter, a Moon Druid, and an Enchanter wizard) and you've just bumped into the Troll Cavern: five Trolls in a 60'-wide cavern, all looking directly at you, standing there in the 5'-wide tunnel which leads into the Troll Cavern. Can you name a buff which is more cost-effective than Web in this situation? (Restrained = disadvantage to attack, advantage to be attacked, zero movement. Allows you to take on only one or two trolls at a time, at a heavy advantage.) Freedom of Movement lasts for one hour, but for the sake of argument we'll say it's dedicated specifically to this fight, so you can choose any two buffs under 4th level. This is nearly a triple-Deadly fight so spending a 4th level + 2nd level spell slot on this fight is a reasonable thing to do.
Web does not cover a 60 foot wide cavern. Depending on the depth of the cavern (anywhere from 20 feet to 60 feet say), the web spell would cover anywhere from 11% to 33% of the room. The wizard would need to see into the room, so he would have to be near the front of the group. Odds are that he might get 2 of the 5 trolls in the spell and odds are that both of them will be out of it within 2 rounds. The trolls cannot all fight the PCs anyway due to the 5' wide chokepoint tunnel that you created, so the Web spell would be totally wasted. The wizard could put the web spell 5 feet away from the tunnel so that the Paladin can move to melee on the one side and the Druid on the other, but meh. Hardly much better than staying in the tunnel.
Sure, we can all come up with contrived situations where a given spell might work great. This particular scenario is advantageous for the PCs because the trolls cannot even fit in the 5 foot wide tunnel into their own cavern. I'm not even sure why you posted this. It doesn't illustrate anything.
And having used Web a lot for my wizard, it gets old after a while. What good is having a versatile wizard if in order for him to be even partially effective, he has to cast the same few spells all of the time?