When the network is congested, clicking "Send" doesn't give you the instant on-chain feeling; instead, it first gets queued in the mempool. Basically, it's like a bunch of people crowding the same door: if you pay average gas, you're left waiting; if you pay high gas, you cut in line; sometimes your subsequent transactions from the same address get stuck (that nonce issue—if the previous one isn't confirmed, the ones after can't move). What's more annoying is thinking "unsuccessful = no big deal," only to find out later that your transaction gets packed, and your mood just breaks.

Recently, before and after the main chain upgrade/maintenance, people in the group have been guessing whether there will be a migration. I just treat it as "possibly more congested": do important operations in advance, and if I really need to move, I do a small test first.

As for impulsively placing orders... my current habit is pretty old-fashioned: when I see an opportunity, I first close the transaction page, check the mempool and estimated confirmation time, then force myself to wait 3 minutes; only if I can endure these 3 minutes do I deserve to spend gas. Most of the time, if I can't hold back, it's just emotional trading—forget it.