I don't think a global temp table would necessarily be immediately dropped. But overall I agree, there's no great concern to drop temp tables in the code, unless perhaps:
1) you have a very large number of temp tables; and/or
2) the temp tables are (very) large; and/or
3) you have a very long amount of processing to do later in the same proc.
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".